Why you need an air micro die grinder

**Oldneweng** · 17th August 2013, 08:56 PM

Originally Posted by nearnexus

Hi Dean,

That's great information. You don't know how hard it is to get people to contribute to the web. I will incorporate that into the pages.

The fact that a Dremel collet will fit is actually a big deal. What it means is that if the collet in the die grinder stuffs up, you can get a Dremel as a replacement. Trying to get an OEM die grinder part would be very difficult.

So all this information is actually quite valuable.

To modify a hardened collet you could use the die grinder and a smaller diamond burr as in my video to do the job. Once again, this sort of work would be near impossible any other way.

These units are really very useful for this sort of work.

Here's a shot of my 3 mm collet (unmodified).

Attachment 281458

Have you checked yours with a magnet to see if it is steel ?

The radial runout is not massive, but I did detect some given the basic style/fit of the collet.

Cheers

Rob

Checked with magnet? First thing I did. Clink. I think my collet is better finished although it is hard to tell with photos. I will try to remember to take a picture of mine tomorrow. Modifying the collet. Lucky I have the dremel collets but will have to check how well they work. I have some diamond burrs but they are 1/8 inch shaft.

Dean

**azzrock** · 17th August 2013, 09:22 PM

regarding that blokes video i would of tried a carbide drill before let that grinder near my lathe

**Oldneweng** · 18th August 2013, 06:51 PM

A picture of the two collets. This was one of my first shots in anger with my new SLR. It is a lot more complex to use than the old Film ones languishing in the cupboard. Take me a while to learn it fully.

Collet Comparison.jpg

Dean

**nearnexus** · 18th August 2013, 07:38 PM

deleted duplicate post

**nearnexus** · 18th August 2013, 07:40 PM

I take it the one on the left is from the air grinder ?

The one on the right looks to have a longer tapered section on the screw cap end ?

Angles look a bit different.

How well does the Dremel one fit ?

Rob

**Steamwhisperer** · 18th August 2013, 08:51 PM

In at Bunnings today.
I counted 4 sets

Phil
IMG_3950.JPG

**Oldneweng** · 18th August 2013, 10:49 PM

Originally Posted by nearnexus

I take it the one on the left is from the air grinder ?

The one on the right looks to have a longer tapered section on the screw cap end ?

Angles look a bit different.

How well does the Dremel one fit ?

Rob

Correct.

Yes the taper is longer plus the parallel section.

Angle does look smaller on the dremel.

It seems to fit ok but I have not tried it running yet. If I was keen I could set both up with an indicator to compare runout.

Dean

**Black Ned** · 19th August 2013, 08:54 AM

Steamwhisperer!!!!
This is my receipt - show it to Bunnings to match price!!

regards Ned

Note: these were reduced by varying amount to get to this price. Ticket was orange clearance - Original price $44.00 - 33.00 - 24.00 when I bought it. same in other Bunnings in Newcastle/Maitand/Lake Macquarie stores. - I think that they are changing suppliers and shifting old stock.

E-mail DSC00185.jpg

**GTVi** · 19th August 2013, 12:05 PM

Originally Posted by nearnexus

They also do a 4 bearing model which is more for continuous use.

MICRO AIR GRINDER - STRAIGHT HEAD #G69

Thanks Rob for the heads up. I had this little unit delivered recently. I'm sure I will find many uses for it.
I already have a couple of Dremels, but this air grinder feels so much better in the hand and more powerful.

I have only started it up and had a short play with it. I normally use it to "high flow" throttle bodies. With the slim body it will make that job easier.

Cheers,
Bill

**nearnexus** · 19th August 2013, 01:05 PM

Originally Posted by GTVi

I have only started it up and had a short play with it. I normally use it to "high flow" throttle bodies. With the slim body it will make that job easier.

Cheers,
Bill

Should be good for that sort of work.

It seems that everyone thinks "Dremel" for this sort of work, and these air powered units slip under the radar.

Probably a marketing thing, and not everyone has an air compressor.

The fact that these can't be burnt out and are dead easy to mount on a tool post make them a winner IMHO.

Rob

**neksmerj** · 22nd August 2013, 03:41 PM

This old school item may be of interest to someone looking for a pencil type micro grinder. So far it's cheap.

Hanging Flexible Drive Micro DIE Grinder 12000 RPM | eBay

Ken

**weldcrazy88** · 23rd August 2013, 10:19 AM

Originally Posted by Oldneweng

I bought one off EBay after reading about them in the thread about improving on the dremel. It is the nearest thing to a TPG I have at the moment, although I am yet to make a holder.

Dean

how much did you pay for it off of ebay??

**Anorak Bob** · 23rd August 2013, 11:05 AM

After a fruitless search at Bunnings and being a cheap skate , I bought a budget grinder from "Melbourne Tools" - Grinding Stones AIR DIE Grinder Wrenches Tool Combi SET ALL Grinding KIT | eBay

I notice that the CTC 4 bearing model comes with both a 2 and a 3mm collet. I imagine the Melbourne special is accompanied by a lone 3mm. Now here's the thing, I have a Grobet USA catalogue, 24 pages of which are devoted to jeweller's burs BUT they are 2.4 mm (3/32") shanked. Quality German and Swiss burs are available on Ebay but again smaller shanked - Setting Burs FIG413 Jewelers Burs Stone Setting Jewelry BUR SET 024 050 12 Piece | eBay

Has anyone had a go at making a miniscule collet for one of these grinders?

BT

ps , Might be an opportunity to put Marcel to work - https://www.woodworkforums.com/f65/it...7/#post1683270

**Oldneweng** · 23rd August 2013, 11:15 AM

Originally Posted by weldcrazy88

how much did you pay for it off of ebay??

$33.96 from toolsntoysmega.

Cheers

Dean

**nearnexus** · 23rd August 2013, 12:32 PM

QUOTE=Anorak Bob;1687833]After a fruitless search at Bunnings and being a cheap skate , I bought a budget grinder from "Melbourne Tools" - Grinding Stones AIR DIE Grinder Wrenches Tool Combi SET ALL Grinding KIT | eBay

I notice that the CTC 4 bearing model comes with both a 2 and a 3mm collet. I imagine the Melbourne special is accompanied by a lone 3mm. Now here's the thing, I have a Grobet USA catalogue, 24 pages of which are devoted to jeweller's burs BUT they are 2.4 mm (3/32") shanked. Quality German and Swiss burs are available on Ebay but again smaller shanked - Setting Burs FIG413 Jewelers Burs Stone Setting Jewelry BUR SET 024 050 12 Piece | eBay

Has anyone had a go at making a miniscule collet for one of these grinders?

BT

ps , Might be an opportunity to put Marcel to work - https://www.woodworkforums.com/f65/it...7/#post1683270[/QUOTE]

Bob, my CTC pencil grinder set came with a spare collet in size 3/32", as well as the 3 mm collet fitted in the unit.

They look pretty easy to make - it's a very simple design.

Also slightly OT I was in Bunnings at Mile End and I see they have the next size up die grinder (with lever throttle control) with a set of grindstones for $20.

This is the same price I got one from CheapAuto a while back.

They are quite a good unit for the money. I use it for cutting with a thin friction disc. They use a lot of air though.

Worth a look.

Rob

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