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-   Cutting various materials - bit selection, feeds, speeds (http://www.mechmate.com/forums/forumdisplay.php?f=82)
-   -   12/14 free machining mild steel (http://www.mechmate.com/forums/showthread.php?t=3910)

Quadro Mon 01 October 2012 02:29

12/14 free machining mild steel
 
I have been ask to make a custom golf putter head out of 12/14 'high speed' free machining mild steel.
What is classed a 'high speed'?
Has anyone had any experiance with machining it?

KenC Mon 01 October 2012 03:48

I think its 706

Surfcnc Mon 01 October 2012 06:39

http://www.ajmarshall.com/Manganese.htm

Looks like carbide mills will do it but no Rockwell hardness data to go on to be absolutely sure.

Ross

Allegheny Mon 01 October 2012 16:13

I could be wrong and you might be able to do this, but I wouldn't even think about trying it.

The surface cutting speed and chip load for steel is one, if not two orders of magnitude below what a router or spindle can commonly be set. A MM also has nowhere near the rigidity needed for machining metal - consider that a Bridgeport weighs in at 2,00-2,400# and it's top speed is around 1,000 rpm (which is almost never used).

If you decide to try this, I suggest you set everything on the slowest speed, with a feed rate as slow as possible (as in 0.001-0.005" per second - but only if you can get the spindle rpm to the 400 - 500 rpm range). Even then, I'd make sure you set up plenty of guarding with plexiglass as the bit will almost surely shatter.

Brian
Taxachusetts

Quadro Tue 02 October 2012 02:42

Thanks for reply Brian,
I think the spindle will burn out at that rpm.
I'll put it down to a bad idea.

Thankyou once again.

MetalHead Tue 02 October 2012 12:00

First real question should be why the heck do you need a HSS golf putter :)

Quadro Tue 02 October 2012 15:46

I don't know?
I have only 'played' golf once, 20 years ago it involved beer at each hole and golf buggies with a trailer full of beer to 'top up'. By the end of the game the Golf Club offered me a job to mow/slash the grass, double vision was not helping:D:o.

I was given this link to a steel putter thingy.

danilom Tue 02 October 2012 16:07

this guy made a cnc mill for that task, but his are made from brass

here is his site
http://www.deschampsputters.com/process.html
and thread on cnczone
http://www.cnczone.com/forums/vertic...ill_build.html
and video of machining
http://www.youtube.com/watch?v=9vWqH...layer_embedded

I am posting this as its very interesting and parts have a beautiful finish, you might learn something or even try machining brass on mechmate :)

p.s. don't know why I remember all this stuff but 2 years ago I got cnc crazy and read all interesting stuff on the cnczone :)

KenC Tue 02 October 2012 21:31

Always fancy copper head. some how it feels & sounded better than steel head.


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