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Qualters and Smith Qdm750 Restoration

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AJAX29/01/2022 11:43:47
433 forum posts
42 photos
Posted by Pete. on 28/01/2022 23:11:08:

Thanks both, I've wired up the motor and inverter, so over the weekend I'll have a play with that setting it up.

I also have a Meddings in a quite sorry state, the same as one recently posted on here in a 'what is a Meddings drill worth' thread, so I can't draw any honest comparison yet as I'm yet to fully dismantle it.

Yours is the floor standing model Ajax, so other floor standing equivalents might be comparable, but in the bench top category I don't think there's many comparable, Obviously the Kerry iterations which appear to be linked in design closely, but there aren't many bench top drills rated for putting a 20mm hole in steel.

I'll take a look at the Meddings when time permits and possibly give it the same treatment, although it's not back geared so it will not be replacing this, which model of Meddings do you have Ajax?

Meddings M4/3 and M5/3. Pulley and backgear driven, up to 25 mm in steel I believe. They are certainly substantial in build.

Pete.29/01/2022 21:55:52
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910 forum posts
303 photos

If you ever decide to do any work on them take some photos of the guts, it'd be interesting to see how they're put together.

Had a play with setting up the inverter, ran an auto-tune which is supposed to make the vector thrust feature work a bit better.

It all appears to be working well.

img_20220129_214135.jpg

Saint Tricky12/02/2022 06:51:51
3 forum posts
Posted by Pete. on 25/01/2022 01:44:45:

For anyone replacing the bearings, on this revision the bearings are 25mmx52mmx9mm and 1"x2"x3/8" for the upper pulley assembly, and 1"x2 1/4"x5/8" deep groove, 17mmx40mm12mm angular contact for the spindle.

Hi,

Great write up, so glad I found it.

I’ve just removed the bearings from this model drill and am struggling to find replacements at a reasonable price, current total is £165.

Specifically it’s the 25x52x9mm DGB that’s breaking the bank at over £65.

Does anyone know of a good supplier with more respectable pricing please?

Many thanks

Pete.12/02/2022 22:27:33
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910 forum posts
303 photos

Hi, Martin who has commented on this thread recommended a company to me, Longford Bearings, I ordered all of mine from this supplier, two were Japanese Koyo, two were Austrian NSK iirc, with tax they came to about £90 for all four.

Hope this helps, Pete

Edited By Pete. on 12/02/2022 22:56:08

Saint Tricky13/02/2022 14:09:18
3 forum posts

Thanks for this, I’ll give them a call on Monday. 👍

Saint Tricky23/02/2022 19:46:02
3 forum posts

Hi,

Just a quick note to finish off my bit….

I received the bearings today from Longford Bearings, 3 Koyo and 1 SKF, £95 including postage. 🤗

Thank you for the heads up.👍

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