By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Weldon Shank in collet?

All Topics | Latest Posts

Search for:  in Thread Title in  
Shent14/12/2019 22:02:05
46 forum posts
25 photos


I am about to receive my first benchtop mill so a little green to all this, first job is to machine some mild steel and unknown steel (not stainless) upto about 10mm thick. Benchtop milling machine, 1.5hp motor max 2500rpm.

I have seen some nice end mills on a few websites but they all have a flat milled into them. I Know I can physically put the end mill in a r8 or er25 collet but wanted to know if it would cause any issues ie slippage, crushing of collets etc....or if anyone has any recommendations for end mills that would be great as the selection is overwhelming.



old mart14/12/2019 22:22:11
1917 forum posts
151 photos

I have some end mills with the flat, and they are generally put in a standard R8 collet. I make sure the flat in centralised in one of the three segments. With er25 collets, I would try to get the maximum amount of full diameter into the collet, even if that meant leaving only a small length of shank protruding. Just make sure the drawbar is tight.

Edited By old mart on 14/12/2019 22:23:59

Paul Lousick14/12/2019 22:23:15
1501 forum posts
571 photos


The end mills with a flat should not be a problem. I have a couple and use them in an ER collet without any problem.


David George 114/12/2019 22:53:25
1304 forum posts
447 photos

Hi Mark welcome to the forum. You shouldn't have any problem with that style of cutter in a collet. They are called Weldon type and the holder has a grub screw to secure the cutter but it will make no difference to you as long as you tighten the collet up to proper force. If you use an ER collet it should be very tight perhaps more than you expect. But in a R8 type collet just make sure it has enough length and to usual force.


Bandersnatch15/12/2019 01:19:25
1716 forum posts
60 photos

As others have said there isn't a problem using weldon-shank cutters in a collet but f it's your first experience with a milling machine I would ditch the "unknown steel" and stick to known material until you have a bit of experience .... if you have any trouble you won't know whether it's your technique or the material and it's difficult for others to advise - a situation that comes up quite often here.

old mart15/12/2019 14:30:02
1917 forum posts
151 photos

If the cutters are hss (steel and magnetic) rather than solid carbide (very weakly magnetic and heavy feeling) then some lubrication will extend their life considerably. You could get a small amount of water soluble cutting oil and dilute it to about 10% and put it in a squeezy bottle to dribble on as you cut.

Shent15/12/2019 17:34:17
46 forum posts
25 photos

Thank you all for the replies. Good to know that I can use the Weldon shank endmills in both r8 and er collects. Good thought about centralizing Mart, it's something I'll need to be vigilant of when tightening up, also nice tip on the oil, I would have just run it at 100%. I have a er25 collect David and had looked up torque ratings with the conses being around 75-80 ft lbs although I have no way to measure (as the er torque spanners i have see are well over £100) so will likely just be cranking down as hard as I think. I can find out what the unknown steel is bendersnatch but without that comment I probably wouldn't have so thanks.


old mart15/12/2019 18:01:23
1917 forum posts
151 photos

Another popular way of dispensing the oil is to use a small cheap brush and one of the oil pots that do not leak when knocked over. I do up the er25 collets by using two spanners and using the bench top and tightening before fitting to the spindle. If tightening in situ, then 12" spanner extensions are a great help.

Shent15/12/2019 18:11:33
46 forum posts
25 photos

I have seen the oil pots used quite a lot on YouTube. That's something else to add to the shopping cart. Should be ok tightening off the machine, my collect holder luckily has 2 flats on it and I have brought a er25 spanner so should be ok, will just have to guess how much by trial and error.

Pete Rimmer17/12/2019 11:24:58
774 forum posts
50 photos

Plain shank with flat is fine I even have dozens of the clarkson threaded cutters that I put in a collet.

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 July 5 2018
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