By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for John Scott 13

Here is a list of all the postings John Scott 13 has made in our forums. Click on a thread name to jump to the thread.

Thread: clocking in
27/09/2021 12:16:48

David, Everybody,

thank-you for the interest in the RF CNC project.

I've shamelessly copied a design from YouTube driving the axes leaving the handwheels in place. With the stepper drivers switched on - you can't move them by hand. Drivers off - you feel the steppers cogging over giving slight resistance to motion. The X&Y leadscrews are replaced with ballscrews which would rotate under axial load without that resistance. I'm told that the steppers probably generate backEMF which may not be good for drivers , i haven't had problems.

 photos  are probably self-explanatory 

The Z acts on the quill. The original quill rack-and-pinion mechanism gives more backlash than i'm happy with.

Controller is GRBL running on Arduino - works very reliably - I am impressed.

Arduino step-and-direction output goes to hefty drivers bought with the stepper motors from cnc4you - works fine - photo shows all the bits - subsequently moved to proper enclosure-

In use for 5 years for shape-simple and shape-complex machining.

hope that's helpful,




Edited By John Scott 13 on 27/09/2021 12:39:06

25/09/2021 18:05:25

I'm new to the forum .

Member of a local model engineering club .

FWIW I have a Colchester Bantam lathe and a Rong Fu ( like a Warco ) round column mill which I have fitted with a simple CNC, retaining the handwheels - so as to have either NC or manual control.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Eccentric July 5 2018
walker midge
JD Metals
rapid Direct
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest