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

How to identify climb milling?

All Topics | Latest Posts

Search for:  in Thread Title in  
Chris TickTock02/10/2020 15:31:14
622 forum posts
46 photos

Hi Guys,

From my previous post I was helped to understand climb milling is feeding in the same direction as the end mill force. However you experienced guys see more than I am presently capable. with reference to the drawings attached which if any and more importantly why is climb milling. To me they all seem conventional, the idea is to mill a radius on the end half the diameter of the end mill.


Chrisclimb or conventional2.jpg

Michael Gilligan02/10/2020 15:38:21
18993 forum posts
945 photos

All should become clear if you put the direction of cutter rotation on those sketches, Chris


old mart02/10/2020 15:39:16
3349 forum posts
208 photos

I don't understand your diagram at all, but climb milling is when the cutter wants to roll along the work and conventional milling is when the cutter wants to roll back the way it came.

Mick B102/10/2020 15:39:54
2023 forum posts
117 photos

Assuming we're looking down in plan view, the climbing mill is in the left-hand one in A and the right-hand in B.

If the tooth or flute entering engagement is able to draw in the workpiece in the same direction as feed because the backlash in the approach has been taken up in the opposite direction, the tooth will have to cut the depth of the backlash plus its normal feed depth. Potential bang, if the backlash is significant.

Colin Heseltine02/10/2020 16:00:55
613 forum posts
218 photos

Someone put up what I thought was quite a handy reminder of climb and conventional milling.

(may have been JasonB - but I'm not sure).


Hope this helps.


SillyOldDuffer02/10/2020 16:31:14
7574 forum posts
1681 photos

My poor old brain has trouble grasping climb vs conventional diagrams without teeth, and it's what the teeth do that make the difference.


Climb milling is better in every way apart from one! Unfortunately it puts maximum stress on the machine. Bad things happen if the machine and work-holding aren't rigid. Conventional milling uses more power for the same volume of metal removed, is slower, and tends to leave an inferior finish, but it puts less force on the machine. So conventional milling is safer on worn and lightly built machines.

I do metal removing cuts conventionally but finish with light climb cuts. Even though they can't take it full throttle most well-adjusted small machines should manage shallow climb milling. Just don't overdo it!


Chris TickTock02/10/2020 16:35:48
622 forum posts
46 photos
Posted by Michael Gilligan on 02/10/2020 15:38:21:

All should become clear if you put the direction of cutter rotation on those sketches, Chris


Thanks Michael my error was putting the arrows in but not where they make contact. With the arrows in where they make contact all is easily understood. Thanks guys.

Chrisclimb or conventional3.jpg

JasonB02/10/2020 16:40:18
21467 forum posts
2455 photos
1 articles

When the direction of the cutter in contact is the same as the direction of the work they combine and become climb milling.


Tony Pratt 102/10/2020 16:40:59
1706 forum posts
8 photos

I'm the same as SOD, rough out conventionally & maybe a light climb cut to finish, this is with a Myford VME mill atm


Martin Connelly02/10/2020 16:48:03
1901 forum posts
205 photos

There are good reasons for climb milling when the machine is suitable. In summary climb milling starts off cutting and ends up with a fine cut. Conventional milling starts off rubbing before cutting and at the end of the cut the sudden release of material from the cut can damage the cutting edge. This is more of a problem with large cuts than fine ones. This means that cutter life is reduced when conventional milling compared to climb milling but may be a marginal difference with home workshop machinery.

Martin C

old mart02/10/2020 17:08:39
3349 forum posts
208 photos

SOD has the best diagram of the two types, it shows clearly the difference and why, if your bed has lots of backlash, why climb milling can grab the work and pull the lot suddenly with unfortunate results. I normally take smaller cuts/feed rates climb milling than with conventional milling.

blowlamp02/10/2020 17:26:44
1519 forum posts
98 photos

Also be aware that milling a pocket reverses the climb/conventional direction of travel when compared to milling the outside of a pocket.


Dave Halford02/10/2020 17:27:31
1758 forum posts
19 photos

None of those will give you an outside radius. The bar movement must be rotational as well. which is where the fun starts.

Hope you want an inside radius smiley

Bill Phinn02/10/2020 18:48:48
576 forum posts
86 photos

The most helpful and succint differentiation of the two I have seen is from 1 min 50s to 2 min 10s in the following vid.

The clockwise/anti-clockwise and internal/external basis for remembering the difference makes it much easier for me to orientate myself in the heat of an actual job.

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
JD Metals
rapid Direct
walker midge
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