Selecting an electric motor for a Myford S7 cross-slide drilling attachment

[GreensandsParticipant @greensands]

Hi – I may have asked this question before but I would be interested to know if anybody could recommend a suitable 12v (or mains) electric motor suitable for driving a small cross-slide mounted drill attachment. The motor would need to be compatible in size for fitting to a Myford S7 lathe and have sufficient torque to drive a 0-1/4” capacity drill chuck preferably with some form of electronic speed control.  All suggestions and possible solutions most welcomed.

[Grindstone CowboyParticipant @grindstonecowboy]

Have seen somewhere on Youtube where a chap made a drilling spindle that was driven by a cordless drill – I can see there are pros and cons against one with a ‘proper’ dedicated and attached motor, but maybe worth considering?

Rob

[Paul LousickParticipant @paullousick59116]

You will probably need some type of gear reduction to lower the RPM and increase the torque, like in an electric drill.

Possibly use one of these motors (this one has a speed encoder but does not have to be used). Select one with a suitable speed reduction.

And a PWM motor controller like this. (Lots of other types available on ebay)

[Nick WheelerParticipant @nickwheeler]

Have you considered an ER11 spindle motor? A motor, clamp, speed adjustable power supply and set of collets will cost about £100 from Ebay.

While it won’t win any award for prettiness, it only took a couple of minutes to bolt a length of 10mm square bar to the clamp, that mounts in a QC tool holder. Then it just drops into place, and will happily drill or mill along or across workpieces with up to a 6mm cutter.

[Harry WilkesParticipant @harrywilkes58467]

This may be of help.  https://m.youtube.com/watch?v=vX-lksLzmHM

H

[Peter Cook 6Participant @petercook6]

With a 0-1/4 chuck, I presume you are going to be drilling smallish holes. As such you need to think  about the speed(s) you will need.

Drilling Torque, Thrust and Power Calculator – Kennametal has an interesting calculator that will calculate power requirements for various drill sizes and hole depths.

[Roderick JenkinsParticipant @roderickjenkins93242]

I used a 200W 220V DC Treadmill motor and speed controller.  I purchased it from hebdenmotorbits on ebay.  Sadly, they don’t seem to be offering anything at the moment.  Has plenty of torque and it drills and mills up to 1/4″ in steel, bits held in an ER11 collet chuck.

Rod

 

 

 

[Harry WilkesParticipant @harrywilkes58467]

Sorry Greensands I misread your question however the same chap in the link as a video on the subject

H

[GreensandsParticipant @greensands]

Hello Rod  – Your arrangement and motor selection is exactly the sort of thing I have in mind. I will certainly keep a look out for that particular model.

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