Cuter speed

[Paul ScholeyParticipant @paulscholey17560]

[Paul ScholeyParticipant @paulscholey17560]

Can someone please advise me on a rough speed to run a 60mm -4 tipped cutter on mild steel for hand feeding.

Regards Paul.

[VersabossParticipant @versaboss]

Hi Paul,

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

Greetings, Hansrudolf

[Paul ScholeyParticipant @paulscholey17560]

Thanks for that Hansrudolf, Think I’ve been running it way to fast then.

[Martin WParticipant @martinw]

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

[WeldsolParticipant @weldsol]

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

[WeldsolParticipant @weldsol]

You could also try this site you want the main catalogue

http://www.sandvik.coromant.com/

 

Paul

[Martin WParticipant @martinw]

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

[ZigFireParticipant @zigfire]

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 WParticipant @martinw]

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

[ZigFireParticipant @zigfire]

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 ScholeyParticipant @paulscholey17560]

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 HartlandParticipant @clivehartland94829]

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 WParticipant @martinw]

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 HartlandParticipant @clivehartland94829]

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 ScholeyParticipant @paulscholey17560]

Thanks for all the replys guys, It will be very useful the speed chart.

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