3 Electric Mini Bench Grinder Polisher Flex Shaft New Multi-Purpose Grinder. Mini bench grinder

30.05.2023 Fordrejurus bench, electric, flex, mini, polisher, гриндер

Mini bench grinder

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Mini Bench Grinder/polisher

Basically all I’ve done is mount and motorise a ‘toy’ grinder to make it a viable tool. Whilst not a particularly taxing project, I think the motor mounting and drive belt construction may be of interest to others, the initial idea was to make a bench mount for a dremel arbour. Then I remembered I had a miniature bench polisher/grinder in a box from when I was little. whilst it was meant to be powered by a static steam engine and as such wouldn’t normally be operated at speeds over a few 100 rpm there was no reason it shouldn’t be driven with an electric motor. There is the possibility that a brass shaft in solid zinc alloy isn’t going to be a good bearing combination for the much higher rpm the electric motor will deliver. The stands for the grinder and polish mops are identical it is just a case of swapping felt wheels for grinder wheels.

Step 1: Components

The basics are an old miniature bench grinder an old buggy motor (originally brought for an experiment in electric flight) a pulley, drive belt and a board to mount it all on. Whilst I happened to have all this and the other sundry items needed laying around doing nothing it doesn’t count as free as it all had to be brought at some point.

A quick check on eBay revealed that even though it was 30 years old in its original box and unused the mini grinder could still be brought for under £5 so I’m not about to ruin something valuable.

The Motor is a graupner speed 400, according to the spec sheet 22000rpm 1 to 7 amps in normal opperation 40Amps when stalled in this installation that should never happen as the belt will slip.

The drive belt is 2.5mm Diameter nitrile rubber.

Step 2: Mounting the Grinder

I used a pice of 4″×3/4″ wooden board some #6×1″ wood screws and screw cups. Mark the position of the holes you are going to use. Make pilot holes I used a gimmlet but a very small drill would do. screw the grinder down to the board.

Step 3: Mount the Motor

A pulley smaller than the motor body would have been better in several respects but I didn’t have one. I drilled the bore of the pulley out to suit the shaft adapter I had. then found a pice of strip wood that would give a clearance for the pulley over the mounting board. decided on a position for it and tacked it in position (in hind sight I should have established directions of rotation before I positioned the motor).I then drilled a hole on both sides to take a cable tie. I chain drilled a channel between the two holes and cleaned it out with a blade so the cable tie sat under the base of the board. next I wrapped the motor in clear plastic tape other plastic tape will do but it MUST be plastic as it stops the car body filler sticking to the motor and from entering the vents. secure the motor in position with the cable tie do not tighten it fully at this point. align the drive pullies using a straight edge. fully tighten the cable tie make sure the lug is on top of the motor this helps if you need to access it later to release it. To make the mount more robust I used 2 pack polyester car body filler, I find that credit card sized plastic loyalty/advertising cards make ideal spreader or moulding plates and I applied a heavy filet to each side of the motor. with a little care the cable tie can be released with a scribe point or a pin and because of the wrapping of plastic tape the motor can be cleanly removed if required.

Step 4: The Drive Belt

you may have noticed I haven’t made any allowance for size or adjustment of the drive belt. This is simply because I don’t need to as cyno acrylate glue (superglue) works brilliantly on rubber in tension. It started out as a much larger 2.5mm diameter nitrile rubber drive belt (I think it came from technobots.com) cut squarely with a razor blade using a small engineering square as a guide (you could just as easily use a lego brick as a guide as they have wonderfully accurate square edges) this length of drive belt was then looped around the pullies to establish the required length then cut slightly short (about 15mm)and square if it’s too lose you can always cut a bit more out. (you could glue another section in if its too short but I wouldn’t recommend it the fewer joints the better) put the belt around the pulley on the grinder apply a drop of superglue to one of the ends and hold the ends together until cured, the drive belt can now be streatched over the pulley on the motor. As a demonstration I made a second belt up with the left overs and put it over a small clamp and streatched it out as you can see from the photos it streatched a good 9cm without distressing the joint. You are using superglue you might want to use tweezers. I find if I do get any on my skin the easiest way to deal with it is absorb it with a tissue whilst this can leave you with a bit of tissue paper stuck on you it will rub off in under a day and it’s better than being stuck to yourself or something else.

Step 5: Apply Power and Test.

The wheels need to turn downwards on the side you are using.I should have established the prefered direction of rotation for the motor and which way the wheels needed to rotate first, but I didn’t fortunaly small DC motors seem quite happy to run in either direction, so I applied power temporarily from a battery pack to esablish the positive and negative needed to be. For a quick test I used the same battery pack as I did to check the direction of rotation, but at a 6Amp load a 1200mAh pack is going to last 12 minutes or less, so a proper power supply will be required. To test polishing I applied a little polishing compound to one of the felt wheels then applied power and tried to buff a flattened out pice of copper pipe after just a few seconds I had a nice bright patch.

Sealey Mini Bench Grinder Ø50mm – Flexible Drive Shaft

A versatile compact mini bench grinder with flexible drive shaft and buffing wheel attachment. Includes nylon, wool and steel wire wheels and equipped with eye shields and spark arrestors for added safety.

Tool rests provide constant control during use and supplied fitted with fine grit grinding stone and polishing wheel.

Whether you need to clean, sharpen, buff or polish, the quick and easy to use Sealey Mini Bench Grinder delivers a performance perfect for the DIY enthusiast and light garage use.

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Sealey Mini Bench Grinder Ø50mm – Flexible Drive Shaft

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up to 1kg = £4.50 small parcel only second class
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2kg = £7.95 via DPD (Mainland UK Only)

Postal option only available on selected products and only available within the UK.

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For certain larger products we offer a mainland UK delivery service for a flat rate of £39.99. Available when you see the “courier” delivery option.

Pre Delivery Inspection. Items marked with the PDI flag indicate that the machine is fully assembled, tested and run up ready to use. Including all oils.

Small bench grinder suggestions

I’m looking to buy a small bench grinder. small in my case means 3″-ish ??

I live in an apartment, so something small is essential due to lack of space. The standard 6″ grinder is wayyyyyyy over kill for my use. My mill/lathe are Sherline and I’m building small steam engines (the plan anyway ). Probably will be used mostly for grinding lathe bits and misc deburring.

Here’s MicroMark’s 3″ grinder :

I have a Dremel and a whole slew of bits and goodies for that. Would that make sense to use for a simple small grinder ? Do up a horizontal mounting fixture for it ?

Any ideas/suggestions appreciated.

jack404

Well-Known Member

i’m doing some business with the Milwaukee company at the moment so a heads up for you

similar item rec retail for the USA will be 99 as you see it pictured

and a small box of bits for the dremel/die grinder type attachment will be released there in a few weeks

kvom

Well-Known Member

Tin Falcon

Well-Known Member

I have a 6″ jet guess I have had it for something like ten years now. The price of grinders has gone up a bit since then. If I were to have to replace it I would seriously look at one of these. 99 at Sears

I know you have a small shop but I think I would find a 3″ grinder too small. IMHO this is a lot more bang for the buck. Some times there is a fine line between a tool and a toy. Ya pays your money and takes your chances personally I would not pay mare than 30 for the one you show and then would think real hard an do my homework. It is you shop your money your decision. Questions to ask yourself are wheels readily available ? How are you going to keep this tiny thing from falling off the bench how will the 2x heat buildup effect tool grinding? is the thin sheet metal tool rest going to meet your needs? How long will a plastic wheel guard last. Hmm

ChooChooMike

Well-Known Member

Hmmmm, I’m seeing some used grinders on Craigslist here in LA pretty cheap. actually there’s a 6″ never opened one for 35, can’t tell what brand from the pic though :

Mcgyver

Well-Known Member

if 6″ is overkill, you won’t want to hear my view. in general one is far better off getting an 8″ grinder than 6″. The cost differential isn’t that great. the reason for going with the 8″ is wheels. Generally you want to replace the wheels that come with them with something a litte nicer (friable, fast cutting) and the selection of 8″ wheels is almost endless where as 6″ are limited.

6 or 8, this is going to make a heck of mess in an apartment. I wonder whether one of wet grinders or the slow turning water diamond grinders might be better (if you use a diamond wheel on steel it has to be slow) ?

gmac

Well-Known Member

1 on Mcgyver’s Комментарии и мнения владельцев. I just bought a 6″ grinder, like you concerned about where I could use it. Started out on the porch and what a mess. on me and the surroundings. luckily I didn’t start out inside! Also found the supply and selection of 6″ wheels limited. Garry

ChooChooMike

Well-Known Member

Yeah, forgot about the grinder spewing crap/dust all over. may have a solution to keep the swarf somewhat contained. I’m kinda using my 2nd bathroom as my little shop. If I put the grinder in the shower stall, that’ll keep all the mess contained Of course the grinder would make one helluvalotta noise in those confines. Or maybe the trick is to bring it outside when I use it ? I don’t imagine I’d be using the grinder all that much except for lathe bits and misc deburring, and

Tin Falcon

Well-Known Member

Ya Know mike if you really want one of those little buggers go for one of these I know HF does not have the best rep but the price is much more in line for how it is made. 35. 99 with rotary shaft tool Micro mark is crazy with prices.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=43533 Other than color it does not look a whole lot different than the other two. Tin

jack404

Well-Known Member

Tin i doubt there’d be any difference other than the source of the wheels and the bits that come with them

I’m learning a whole lot about tools ATM thanks to the deal i’m looking at

its all just what options folks want from bearings to accessories but the units themselves basically are mostly the same

HF have plasic guards instead of cast alu so thats cheaper bearings i dunno but i suggest the motors and base units will be very similar ( i just ordered 2 variants to check out for here and 3 varients of the hand held Band saw) better grab em fast as china made are about to go way up

greenie

Jack, there is a major difference between those two items, the bloody rip-of price that MicroMark is asking.

If you pulled them both apart, you would find the same innards, made by the same mob.

Difference is really the colour of the paint and the name stickers on them.

jack404

Well-Known Member

Actually you may be surprised

i going through the lopp jumps now to be a impoorted distributor ( if. maybe etc)

i’m chatting with the factory as i’m typeing this and options include

type of bearings (3 options from.1.76 from standard, standard, or NGK 3.10 fro standard)

accessorie sets 4 options from 6.25 to 22.80

grinding wheels 15 options including a small rag wheel

guards 3 options plastic cast alu and cast steel

2 options for protective screens ( plastic and lexan )

its a eye opener to me and everyone i have shown this stuff too

and for a fee you can have any name on them you want

give em a sample and they’ll copy it in 3 weeks

the Milwaukee folks have set the options already for there stuff coming from the factory

but with some “special lines” i am looking at just for Oz theres so many options to play with

basically you can get these in numerous configurations from the same factory

from 22 through to 76 depending on what options and accessories and packageing you desire

but the HF one for that price would be hard to go past and even i have some HF stuff i’ve bought from the US when i have been there

A bench grinder is probably not a tool you’ll use every day. However, if it’s available and set up correctly, you’ll be surprised how often it comes in handy for everything from sharpening tools to rounding over thread ends on a cutoff bolt. We’ve assembled these tips to help you get the most out of your grinder.

Family Handyman

Keep a Container of Water Handy

Most chisels and other cutting tools are made of tempered steel. If the steel gets too hot and turns bluish black, it’s overheated and won’t hold an edge very long. To avoid ruining the edge of a tool by overheating, keep water nearby to cool the tool. A good technique is to move the tool once across the bench grinder for no more than a few seconds. Then dip it in the water. If the steel edge does overheat and turns color, grind the edge back to good steel and start over.

Family Handyman

Grind Small Objects Safely

Hold small objects with locking pliers. This keeps your fingers a safe distance from the grinding wheel and protects them against burns from the hot metal. It also gives you better control over the grinding process.

Make Tool Sharpening Guides

Here’s a better way to hold tools securely while you’re grinding them—and take the guesswork out of creating the right bevel angle. It’s a short piece of 2×4 with an angled end and a 1-1/4-in. hole for a clamp. I made one for sharpening chisels and plane blades, and a few more with different angles for wood-turning tools. Large labels with the tool’s name tell you which blocks are for which tools. For a Delta grinder with a 6-in.-diameter wheel, a 5-1/2-in.-long piece of 2×4 aligns the tool to the wheel just right. For other bench grinders, you may need to adjust this length. Note: The angle you cut on the block is not the same as the tool’s bevel angle. But let’s skip the math. To determine the block angle, turn off the grinder and hold the tool’s bevel flush against the wheel. The angle of the tool shaft to the workbench is the angle to cut on the 2×4. Our thanks to Ray Caputo for this sharp accessory.

Family Handyman

Consider a Low-Speed Grinder for Sharpening

Unless they’re variable speed, most bench grinders run at about 3,450 rpm. If you’re careful and keep the wheel dressed (more on that in another tip), these high-speed grinders work fine. But for sharpening garden and other tools, a low-speed grinder running at 1,750 rpm is a better choice. The lower speed reduces the chance you’ll overheat the edge of your tool. Another advantage of a low-speed grinder (100 to 150) is that this type typically includes friable white grinder wheels, which do a better job of sharpening than the gray grinder wheels usually included with high-speed grinders. See how to use an angle grinder.

Family Handyman

Dress Wheels Frequently

Wheel dressing squares the face of the wheel, but more important, it exposes new grit for more efficient cutting. As a wheel is used, the spaces between the cutting grit can become clogged, and the grit itself dulled. A wheel in this condition can cause overheating and slows material removal. A wheel dresser like the one shown here (15 to 30) has a bar with diamond grit impregnated in it. Holding the bar against the spinning wheel cuts away the surface to expose new grit, squares the face of the wheel and rounds the wheel. To use a dressing tool like this, start the bench grinder and wait for it to reach full speed. Then press the diamond wheel dresser against the spinning wheel, holding it perpendicular to the face of the wheel. Be sure to wear a good-quality dust mask. The fine aluminum oxide dust is very bad for your lungs. Draw a pencil line on the wheel before you start to help you gauge when you’ve removed enough material from the wheel. Dress the wheel just until the pencil line disappears.

Family Handyman

Watch for the Sparks to Come Over the Top

When you’re sharpening a chisel or other tool, you can tell when the edge is getting sharp by watching the sparks. When the edge is blunt, the sparks are deflected downward. But as the edge gets sharper, the sparks roll over the tool and cascade down the surface facing you. When you see this start to happen, be careful about grinding much more because a thin edge is very vulnerable to overheating.

Family Handyman

Make an Angle Gauge

Chisels and other cutting tools work best if their edges are ground at the correct angle. You can search online to find the optimal angle for whatever tool you’re sharpening. Most wood chisels should be ground to about a 25-degree angle with a secondary micro-bevel angle of 30 degrees on the tip of the blade. An angle gauge allows you to set the tool rest at the desired angle. You can make an angle gauge from a thin piece of cardboard using an inexpensive protractor. 1. MARK THE ANGLE ON CARDBOARD Align the center mark on the protractor with the top edge of the cardboard. Then turn the protractor until the desired angle is also aligned with the top edge. Draw a line along the protractor to mark the angle. Don’t forget to label the angle. Cut along the line to create the gauge. 2. ADJUST THE TOOL REST Set the cardboard on the tool rest and adjust the angle of the tool rest until the wheel contacts the center of the angled portion of the cardboard gauge.

Family Handyman

Upgrade the Tool Rest

Inexpensive bench grinders have tool rests that are finicky and difficult to adjust. If you do a lot of tool sharpening or simply want a bench grinder tool rest that’s easier to adjust, consider adding a stand-alone tool rest. There are several variations, some made for specific tasks like sharpening lathe turning tools. This Veritas model has two adjustments for positioning and aligning the tool rest, and levers for easy tightening. You can also buy an attachment that holds chisels or plane irons.

Family Handyman

Make Your Grinder Portable

Even the most nicely organized home workshops don’t have enough bench space to devote a section to a bench grinder. A good solution is to mount your grinder to a board or small stand so you can clamp it to the bench when you need it, and store on the shelf when you don’t. The compartment on this grinder stand is a good spot to keep your dressing tool and safety glasses so they’re handy when you need them. For a fancier version, build a little drawer to fit the space under the grinder. The stand is built from two 12 x 16-in. pieces of 3/4-in. plywood separated by two 4 x 12-in. uprights. We used two 5/16-in. bolts with washers and nuts to attach the grinder, leaving enough space in front of the grinder to mount a stand-alone tool rest.

Easy-to-Clamp Mobile Base

Shazam! Fasten your bench-top tools to your workbench in seconds. Bolt 3/4-in. plywood bases on the tools and then glue and screw a wood strip along the front edge to fit into a woodworking vise. Crank this strip into a vise to lock the tool into place. If you don’t have a vise, drill a couple of clearance holes along the face of the wood strip on the base and drive screws through the strip into the edge of your workbench. Then just unscrew to remove the tool.

Family Handyman

Set Up a Polishing Station

A bench grinder fitted with a wire wheel on one side and a cotton buffing wheel on the other side, or buffing wheels on both sides, makes a great cleaning and polishing tool. You’ll also need a set of polishing compound sticks (14). Polishing compound sticks are color coded to indicate the grit, from coarse to very fine. To use the polishing wheel, hold the stick against the buffing wheel as it spins to transfer some polishing compound to the wheel. Then hold the object lightly against the wheel and let the compound polish the surface.

Family Handyman

Sharpen Your Lawn Mower Blade

Sharpening your lawn mower blade is easy with a bench grinder. Grind the tapered cutting edges with a grinder only if you see nicks in the blade. Follow the factory angle of the cutting edge. The grinder will remove nicks in the blade much faster than you can file them.

Family Handyman

Not All Grinding Wheels are the Same

You can use two kinds of aluminum-oxide wheels to sharpen your chisels; one is blue-gray and the other white. We used the darker-color wheel, which is harder and will keep its shape longer. The drawback, however, is that it grinds hotter than the softer, white wheel. Too much heat will weaken the steel. The soft wheel will need more frequent shaping with a dressing tool, but you’ll be less likely to burn the edge of your chisel while grinding. For best results, use a 100-grit wheel to shape your chisel blades.

Know When to Replace a Wheel

Slide the wheel over your finger and tap the wheel in four places with a screwdriver handle. All taps should sound the same. If they don’t, scrap the wheel. It’s cracked.

Sources:

https://www.prolinemax.com/products/3-electric-mini-bench-grinder-polisher-flex-shaft-new-multi-purpose-grinder
https://www.instructables.com/mini-bench-grinderpolisher/?amp_page=true
https://www.ernestdoeshop.com/product/sealey-mini-bench-grinder-o50mm-flexible-drive-shaft/
https://www.homemodelenginemachinist.com/threads/small-bench-grinder-suggestions.2843/
https://www.familyhandyman.com/list/bench-grinder-basics/

Mini bench grinder

CA Prop-65 Warnings

Payment Security

Mini Bench Grinder/polisher

Step 1: Components

Step 2: Mounting the Grinder

Step 3: Mount the Motor

Step 4: The Drive Belt

Step 5: Apply Power and Test.

Sealey Mini Bench Grinder Ø50mm – Flexible Drive Shaft

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Sealey Mini Bench Grinder Ø50mm – Flexible Drive Shaft

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Small bench grinder suggestions

jack404

kvom

Tin Falcon

ChooChooMike

Mcgyver

gmac

ChooChooMike

Tin Falcon

jack404

greenie

jack404

Keep a Container of Water Handy

Grind Small Objects Safely

Make Tool Sharpening Guides

Consider a Low-Speed Grinder for Sharpening

Dress Wheels Frequently

Watch for the Sparks to Come Over the Top

Make an Angle Gauge

Upgrade the Tool Rest

Make Your Grinder Portable

Easy-to-Clamp Mobile Base

Set Up a Polishing Station

Sharpen Your Lawn Mower Blade

Not All Grinding Wheels are the Same

Know When to Replace a Wheel