Which motor ?

[here againParticipant @hereagain]

I bought a small motorless bench drill for small hole drilling.  Its an old English solid machine about 14ins tall and 7 front to motor mount

Having trouble finding a suitable motor. Tried 12v types but no where near powerful enough. I have a spare 1450 rpm motor but way too big and heavy all else seem to be 10 000 rpm types which would require an interesting array of pulleys! Dont really want to get involved with speed control ,expensive and I dont’do’ electrics either. Just a motor to bolt onto back.!thanks Jonathon.

[noel shelleyParticipant @noelshelley55608]

You say for small hole drilling HOW  SMALL ? 10,000 is not nescessarily to fast( 1mm in alli 20,000 ) and 5000 would be a good speed for a 2mm drill bit. So your 10,000 rpm motor and a 2/1 step down to drill spindle would work fine ? Noel.

[BazyleParticipant @bazyle]

Maybe an industrial sewing machine motor? You only want 1/4hp I should think. Photo or details of make / model might help us understand the situation.

[here againParticipant @hereagain]

<p style=”text-align: center;”>Thanks very much. I did try a photo but seemed to be a huge zoom ! No name on machine. I was thinking of ‘normal’ drill speeds- in the hundreds. No idea what I d need thousands for. Only down to 1mm usualy.</p>

[duncan webster 1Participant @duncanwebster1]

1mm drill at 100 ft/min (about right for free cutting mild steel) is ~10000 rpm. Ally and brass faster ideally.

[here again]

On here again Said:

Thanks very much. I did try a photo but seemed to be a huge zoom ! […]

Don’t worry … they usually end-up looking O.K. after you have submitted the post

Just one of those endearing little ‘features’ of the forum software.

Please try again

MichaelG.

[here againParticipant @hereagain]

<p style=”text-align: left;”>Yikes had no idea that was  the speed for 1mm drilling. I dont think the bench drill bronze bearings would do that for long.</p>

[here againParticipant @hereagain]

[Michael GilliganParticipant @michaelgilligan61133]

The reference speeds are often fanciful … It depends how you work.

Generations of watchmakers, et al, have drilled tiny holes at slow speeds.

MichaelG.

[here againParticipant @hereagain]

Thats a relief Michael. Sewing machine motor looks best..

[Martin of WickParticipant @martinofwick]

Have you considered one of the commonly available DC E scooter/cycle motors? – usually available as 12- 24V, 120+ watts with speeds in range 3k to 6k. Nice ‘n torquey. You could also add a PWM speed controller too. Will need suitable universal power supply adding an extra £30 or so to cost.

DC Electric E Scooter Motor 24v 120w 16T Belt Sprocket ZY6812 Reversible 24 Volt | eBay

Somebody has already suggested a fractional HP induction, which would also do well given the size of the unit, but by its nature, will be quite large and quite expensive.

I fear you will be disappointed with a 10000rpm  AC universal sewing machine motor (if that is what you are referring to). Even for sewing machines they can be considered as rubbish in this day and age, as better alternatives are available.

[Martin of Wick]

On Martin of Wick Said:

[…] I fear you will be disappointed with a 10000rpm  AC universal sewing machine motor (if that is what you are referring to). […]

… I suspect it is not ^^^

Bazyle’s earlier post was not explicit, but I presumed him to be referring to the very popular modern motors.

MichaelG.

[BazyleParticipant @bazyle]

Gosh – double take when I saw the pictures. I’ve got the same drill only in brown paint. That sort of vertical handle or rod sticking up at the back by the motor plate is a countershaft to hold an intermediate pulley. My motor is about the size of a sunneydew mellon. I think you should find one cheap if you are patient because people think they are too small for a lathe.

I have a 3mm drill permanently in mine to start off holes then go to the larger generic Excel/Warco bench drill.

[noel shelleyParticipant @noelshelley55608]

Having seen the picture, that is not a small drilling machine and a 370W 4 pole motor would be fine. Just make it fit ! Noel.

[Michael GilliganParticipant @michaelgilligan61133]

Given that there is a lot already missing … I would be tempted to remove all the redundant parts and fit a good modern variable speed motor to it.

MichaelG.

[BazyleParticipant @bazyle]

Only the intermediate pulley is missing, and belts.

[Michael GilliganParticipant @michaelgilligan61133]

I’m not arguing, Bazyle, but I would personally consider the absence of the motor and the intermediate pulley system to be “a lot”… and I think it would be better-value to strip any excess and simplify the drive.

MichaelG.

[Nigel BennettParticipant @nigelbennett69913]

The machine itself is a Cowell’s of Watford affair. They supplied partly-machined bits and pieces and you made the rest. I’ve got the 1/2″ version; I built it in 1975 or so. I think yours is the 3/8″ type but many parts – and the speed reduction arrangement – is similar to mine. I’ve got a Brook Crompton Parkinson 1425RPM 1/3 horse (250W) motor on mine.

[Brian SelbyParticipant @brianselby80227]

I  would go with this type of kit, I have just fitted this type of motor and controller to my Dore Westbury miller and it transformed it.

https://www.aliexpress.com/item/1005005715681191.html?spm=a2g0o.productlist.main.15.318b5O0m5O0mkd&algo_pvid=e469a283-5437-494a-987b-07eb5cee6ea5&aem_p4p_detail=202411190605117118318962976750000098414&algo_exp_id=e469a283-5437-494a-987b-07eb5cee6ea5-7&pdp_npi=4%40dis%21GBP%2192.29%2159.99%21%21%21113.60%2173.84%21%402103835c17320251113717736edfb7%2112000042697524068%21sea%21UK%216066829870%21X&curPageLogUid=E3l5wf6RiNTr&utparam-url=scene%3Asearch%7Cquery_from%3A&search_p4p_id=202411190605117118318962976750000098414_2

 

Brian

[here againParticipant @hereagain]

Wow. A Cowells drill for £20.
<p style=”text-align: left;”>With a variable speed motor like Brians thats good or scooter motor,, I think thats the easiest way. I ll try to find one in UK so postage will be cheaper if it had to go back!</p>

[here again]

On here again Said:

Wow. A Cowells drill for £20.

NOT to be confused with the Cowells who advertise on these pages !

MichaelG.

 

[BazyleParticipant @bazyle]

Aha. https://www.model-engineer.co.uk/forums/topic/e-w-cowell-drill-press/

We have been here before. I didn’t recognise the similarity with mine when this came up. Note in that thread  the ever researchfull MG mentions a similar unit from Amolco. Guess what, A Mole traded from barely 100 yds away.

and many pictures here http://www.myford-lathes.com/grinding9.html

 

[Michael GilliganParticipant @michaelgilligan61133]

Norman Mole was a fine chap …  and we always made a point of visiting the shop when passing through Watford.

MichaelG.

.

P.S. __ in the hope of cleansing internet mythology:

 

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