1.6X .35mm tapping

[Bell 430]

greetings fellow chip makers. In work here we just received a proto type job which has a number of 1.6X.35 tapped holes. I have hand taps, but i've ordered two thread mills and 2 single point cutters. my question is what might be a good starting speed, RPM,Inches per minute etc.
this is being run on a brand new HAAS TM-3P. I'm using featurecam 2014. When i put the info into featurecam, I didn't like the results, it gave me an RPM of 7465, 100 mm per minute.
Any help would be appreciated. I'm also trying to convince thread milliung is faster and more accurate the using a regular tap in the machine.

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[ghyman]

What is the material?

[Bell 430]

Sorry, forgot that part, its 6061 T6

[ghyman]

Well, my first thought is that the RPM may be a little off. Does the machine have the stock 6K spindle?

Secondly, where on earth are you finding thread mills that small?!?!

The part that gets me, though, is that feedrate... that works out to about 13 microns per rev (rough numbers) And while it *is* aluminium, the T6 condition will make it subject to tool wear; especially with a tool that small. I'd back that down to about 5-8 per rev.

[Bell 430]

Yes it has the stock 6K spindle. on the thread mill, Vargus and MSC 5-8mm per rev?

[ghyman]

5-8 microns! (.005-.008 / rev)

I don't think I would trust a thread mill that small to hold up without a 10K spindle; I think you will see it gumming up the cutter.

But at that small of a diameter, a high feedrate is definitely a bad thing.

[djm77]

I would look at roll/form taps. Straight in, straight out. We use them on 316 St/St all of the time. We used to thread mill them but it took too long with a thread mill of that size as you can't just go shoving it into the material as you would with a larger one. We took about 5 mins out of a 10 min cycle time using roll taps. They run at about 1600 rpm in st/St.


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[Bell 430]

thanks, any idea where i might find some roll taps this small?

[Bell 430]

I found the taps, thanks for the help.

[djm77]

Hi Bell,

We use Walter Prototyp taps (Titex) DP2061105-M1.6

They have a great little calculator on their website that will give you speeds and feeds for Aluminium.

[Bell 430]

thank you for the info. just found out my next project will involve drilling and tapping 143 1.6 holes.