Gallery, Projects and General > How do I??

Milling tool steel

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Darren:

--- Quote from: bogstandard on March 27, 2009, 06:55:31 AM ---
WD40 is definitely NOT the one to use.

Not only is it no good for ferrous materials, because of the temperatures reached during cutting, it just might burst into flames on the job,

--- End quote ---

That'll be part of my problem then....must get proper coolant sorted.... :thumbup:

Bernd:
SPiN,

Sounds like you were work hardening the tool steel. Try cutting the spindle speed in half and give it a bit more feed, and then try your .030" depth of cut.

With that high spindle speed and taking only a few thou off at a time can work harden the material you are trying to cut.

And of course like Darren said use lots of coolant.

Bernd

Stilldrillin:

Scott,

My thoughts are......

Or should I simply buy a Indexable tip tool such as this? 16 Bucks, plus inserts..
http://www.wttool.com/product-exec/product_id/33787/nm/Indexable_Carbide_Insert_End_Mills_WT_Import_

2000 rpm.

David.

SPiN Racing:
 :worthless:

I Know I know... But I wanted to let you all Know I took everyone's Advice. And went to do some shopping on the cheap.

Pics will be following depending how tired I am when I get home after work.. but I will try to get them up before THursday.

BASICALLY...

I bought the Cutter. .75 Indexable.
Bought a C6 Ti coated little cutter for it.
I bought some Coolant Trico or something.. 30 Dollars for a gallon, mix with water. I did 15 to 1 ratio for heavy milling.
Bought a little water feature pump for 20 bucks.
A couple 90 degree elbows with fitings for soft 1/2 inch hose
3 buckets from Home Depot, and 3 lids.

What I ended up with issss
A bucket with 4 gallons of coolant.
A 3/8 line coming up from it to a fitting in the lid. That runs over to the mill head with a ball valve to control coolant flow.
Then from there down to a small brass fitting I turned with a 1/8 copper line (soldered) running from that and pointing at the cutter.
The cutter 3/4 in the mill..
the coolant runs out the drains in the table to a bucket with lid on each side of the mill for re-adding to the original coolant bucket. (Cheaper than a 80 dollar pump that would be able to pump from the floor to the mill. PLUS I can check the coolant before putting it back in the bucket etc.)

End result.. 1110 RPM, 40 Thou cut, decent feed speed, and not a wisp of steam or heat or anything... just a nice steady snick snick snick snick snick snick.... and a ton of little shin C shaped bits piling up around the groove.
Put it on autofeed and let it eat... for like 20 minutes a pass. (its a long length of steel)
After a slew of passes.. I now have a .4" deep cut .725 wide in the steel.

This Thursday/Friday  between the other projects looming (change rearend in the race car, do some body work to a spot of rust, and re-paint it be end of the weekend April 12) I hope to make a few passes on either side to widen the hole up so I can re-attack with the dovetail cutter I have. (YES.. I will be going extra slow.... but this thing is sooo nice I may talk to SWMBO and see about getting a indexed Dovetail cutter)

bogstandard:
Nice one Spin.

From your hard going bits in the beginning, you are showing that by taking a little advice really pays off, and are now finding it a lot easier.

You are picking up this machining thing very well. It does get a lot easier the more experience you gain.

Well done

Bogs

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