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Cuter speed

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Paul Scholey31/03/2011 21:35:45
87 forum posts
1 photos
Can someone please advise me on a rough speed to run a 60mm -4 tipped cutter on mild steel for hand feeding.
Regards Paul.
Versaboss31/03/2011 21:49:05
512 forum posts
77 photos

Hi Paul,

100 RPM, give or take...for good tips and hot chips 150


Greetings, Hansrudolf



Paul Scholey31/03/2011 21:58:50
87 forum posts
1 photos
Thanks for that Hansrudolf, Think I've been running it way to fast then.
Martin W01/04/2011 16:04:36
940 forum posts
30 photos
Paul
 
If you go to this site Cutting Speeds Calculator it gives the cutting speeds in feet/min and includes an 'On Page Calculator' for Turning, Milling, Drilling & Reaming for a variety of materials. All that you need to do is to convert from metric to inches for the bar, mill, drill or reamer that is being used, dividing by 25 is good enough for this but I am sure you knew that .
 
Hope it proves useful.
 
Regards
 
Martin
Weldsol01/04/2011 17:37:22
74 forum posts
Hi Martin
The speeds on the calculator site seem to be a bit slow or maybe they are for HSS as they are based on a tool life of 180 mins,
I know on my Bridgeport with a 40mm 3 tip carbide cutter on M.S. I'm running at around 450 - 600 rpm both on auto and hand feed and I get more than 3 hrs out of a set of tips
 
Paul

Edited By Weldsol on 01/04/2011 17:39:15

Weldsol01/04/2011 18:05:13
74 forum posts
You could also try this site you want the main catalogue
 
Paul
Martin W01/04/2011 18:42:25
940 forum posts
30 photos
Hi Paul
 
The site gives speeds for both HSS and Carbide tipped tools for turning but I guess the figures given for milling are for HSS tools as you suggest which is why these speeds seem a bit slow. They also may be wanting to get longer tip life before resharpening is required .
 
Thanks for the pointer to the Sandvik site but I had already got this book marked as I have TCMT tools for my lathe and the tips I bought on Ebay were Sandvik Coromant and I wanted to see what they should cut etc, needless to say this is not what I always use them for though as the 'devil drives when needs must' on occasions.
 
Cheers
 
 
Martin
ZigFire01/04/2011 23:16:00
32 forum posts
Just following on from Paul's cutting speed question, I need to do some slitting on the mill and not sure of the cut speeds.
In this case I have a 75mm saw, 2mm thick cutting aluminium. Do these speed tables apply to slitting saws and is there a speed difference for different thicknesses of saw?
 
Regards
Michael
Martin W01/04/2011 23:57:57
940 forum posts
30 photos
Hi Michael
 
This is link Saw Speeds is an extract from Sherline and gives some information re cutting with a slitting saw. If you are cutting aluminium then the speed will be higher but you will probably need a lubricant to ensure the chips don't cold weld to the teeth of the saw. I use WD40 when cutting aluminium to stop clogging but I believe something like paraffin is often used.
 
Cheers
 
Martin
 
PS
 
Here is PDF File from Martindale and on page 13 gives details of saw speeds, feed rates and lubricants etc. This might be more useful overall.

Edited By Martin W on 02/04/2011 00:07:39

ZigFire02/04/2011 03:11:16
32 forum posts
Hey Martin,
 
Thanks for the great links and advice, much appreciated. I never realised there were so many types of saw blades.

 
cheers
Michael
Paul Scholey02/04/2011 21:45:21
87 forum posts
1 photos
I have tried the cutter at about 100rpm and it seems so slow, it doesnt half knock the table and the finish is really rough. I did say a it was a 4 tipped cutter but didn't say they are inserts, puzzled now?
Clive Hartland02/04/2011 22:22:01
avatar
2929 forum posts
41 photos
Can anyone point me towards a source of relief angles for endmills.
I have some 3 flute solid carbide cutters that are chipped and need re-grinding.
 
Clive
Martin W03/04/2011 00:00:28
940 forum posts
30 photos
Paul
 
Have you looked at the site I referred to in my initial post on this thread. You can plumb in the cutter diameter, albeit in imperial, and then it will give you a suitable RPM to cut at for a given material. For different free machining carbon steels the site gives an RPM range from approx. 53 to 200 depending on steel type for the size of your cutter. As the milling table doesn't give a carbide speed it is assumed that the figures given are for HSS and this would agree with general guidance given by Hansrudolf. If you are getting problems with finish or you feel that its knocking too much then I would try taking a lighter cut.
 
Another point to bear in mind is how sharp is your milling cutter because that can affect finish and smoothness of the cutting action. A blunt cutter will definitely cause the machine rattle and produce a poor finish.
 
Hope this helps
 
Martin

Edited By Martin W on 03/04/2011 00:05:40

Edited By Martin W on 03/04/2011 00:07:07

Edited By Martin W on 03/04/2011 00:21:14

Clive Hartland03/04/2011 08:29:26
avatar
2929 forum posts
41 photos
If the Spiral flute cutting edges are damaged/blunt the load on the machine increases and the surface finish is poor.
Flute grinding on an endmill is not really worth it and a new cutter is advised.
If you are using a long cutter they tend to bounce at higher revs and again surface finish is poor.
 
Clive
Paul Scholey04/04/2011 09:42:07
87 forum posts
1 photos
Thanks for all the replys guys, It will be very useful the speed chart.

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