Re: ON TOPIC!!!!!!!!!!!!! Threadmilling...

On Dec 29, 11:04 am, "vinny" <friggenb...@xxxxxxxxx> wrote:
 Ok, anybody in here a threadmilling expert? I'm about to begin my
threadmilling journey to the promised land, and might as well get the 411 on
it first.

Not to many "experts" around eh?
I've done a few large ones ie: 20mm 30mm in 4140 hot runner manifolds
- piece o cake on a Hurco that is.


 Iv'e done some in graphite, but i'm wanting to go 100% tapless in steel. Is
it efficient to threadmill small holes like 6-32, etc... The first one I
have is a 5millimeter in soft stainless. Ordered a couple from threadmills
usa (seemed like a good supplier of threadmills by their name). tialn

thread mill 5mm in soft SS? are you goofy?<g> (yup)
If it were me I'd get the best OSG black oxide or tialn coated tap-
they are commonly called "modified bottom taps" IIRC VC3 for steel -
VC10 for AL
they wind the spiral chips up the flute with little lead - to get
close to the bottom. - Only for use in CNC lead screw taping.

soft SS- OSG taps should last quite a long time with proper thread
cutting oil- never coolant.



 Mastercam's examples show the threads being cut in one pass...seems like it
would break small ones. My current plan is to mill from the top down? Use
standard coolant...am I on the right track?

If its one continuous path top - down - I dont think so.
If its a circle around then out of the hole to clear the chips then -
yes

Its a hell of a lot easier bottom up.


Another question is do you drill the tap drill size, or go .005/.010 bigger
like tapping pre-heatreat? Or go smaller?




Do they break alot? I have a couple of hundred holes in stainless to tap, I
ordered 2 of them...should I get more?

Oh ya at least 1/2 dozen.


Thanx in advance (I hope)
hope?
I hope you don't break the mill & scrap your part.<g>

Oh FYI: Hurco's can "peck" tap - that helps tremendous with tougher
stuff like Titanium.

Their newest ultimax software has a conversational thread mill cycle
for ID - OD roughing, finishing- cutter comp is active- sa weeeet!

Can MC X whatever do that in a g-code cycle?

--


Gil©
Member of
==American Toolmakers==
using the "old world" ways
with yesterdays technology
building
Tomorrows Dreams

http://tinyurl.com/HoldzemOnEbay

.

Relevant Pages

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    ... GarlicDude mentioned spiral flute taps which pull the chips out. ... I use them all the time, but the deeper gullets needed for chip flow make them weaker than normal taps and they therefore have a greater frequency of snapping off in the hole in tougher materials than do regular spiral point taps or form taps. ... 1/4-20 Thread mill $200 ...
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  • Re: Drill depth vs. cut tap depth in blind hole
    ... GarlicDude mentioned spiral flute taps which pull the chips out. ... I use them all the time, but the deeper gullets needed for chip flow make them weaker than normal taps and they therefore have a greater frequency of snapping off in the hole in tougher materials than do regular spiral point taps or form taps. ... 1/4-20 Thread mill $200 ...
    (alt.machines.cnc)