By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale May 23


All Topics | Latest Posts

Search for:  in Thread Title in  
CHARLES lipscombe22/12/2018 21:14:12
78 forum posts
8 photos

I don't know if I have just re-invented the wheel or come up with an idea that others might not have thought of.

I needed to make a number of 16mm balls in brass and doubted my skills on a grinder to make a good job of the form tool. In the end I got a flat piece of tool steel and simply cut a half-circle in it of the right diameter, using a solid carbide end mill.

This worked very well. The end mill was not a high-end specification one, it was a low cost item from Jenny at JB Cutting Tools (usual disclaimer)


ega23/12/2018 14:13:26
1152 forum posts
95 photos

Good idea but how did you provide front rake on the tool?

A "Conecut" drill can be used to make a tapered hole which is then cut back to produce a semicircular tool.

Neil Wyatt23/12/2018 15:10:29
15947 forum posts
674 photos
73 articles

Dang, I posted a reply earlier but...

My approach is to drill a slightly angled hole in a bit of gauge plate, then trim off the excess. See MEW 276!


CHARLES lipscombe23/12/2018 19:31:10
78 forum posts
8 photos

I just placed a small piece of scrap under the front of the toolbit to raise the front and provide what looked like a suitable amount of rake. To the best of my knowledge the exact rake is not critical in this application. I used a spray can of WD40 to lubricate and cool the work in progress.


All Topics | Latest Posts

Please login to post a reply.

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

Latest Forum Posts
Support Our Partners
Eccentric Engineering
TRANSWAVE Converters
Eccentric July 5 2018
Allendale Electronics
Subscription Offer

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