Tread forming taping

[mig]

Hi,

How to cut tread by tread forming taps ? Can I use tread packing cycle for example or rpm ..... e t c? Material -aluminum 6061.I use this type of taps first time . Treaded holes m8 and m6 h6 class ,formed 75% .

Thank you

[mkd]

coolant concentration needs to be strong in 6061. no sense in pecking since there is virtually no chip.

 

you'll love it once dial in. 3-4 time the speed of conventional taps.

 

Check mfger tap hole size recommendations. a few thou on the minor can be the difference between piles of broken taps or none at all.

[mkd]

if tap breaks on the way out coolant is too weak....

ask how i know...............

[djstedman]

Yeah .. always check the minor diameter is right before running the tap through when using form taps.. general rule of thumb is .001" on diameter before forming will be about .003" after forming.. so getting the minor right from drilling is critical when form tapping..

[mig]

Is it possible to finish tread to the bottom by hand ?

[Machineguy]

M8 x 1.25mm is .290 drill min

M8 x 1.0mm is .2953 drill (7.50mm)

M6 x 1mm is .2165 drill (5.50mm)

 

No peck needed, 95% of the time.

 

Set your feed as normal. The only differance is you are forming the threads, not cutting.

No chips at the bottom of a blind hole!

 

Machineguy

[jeff]

This is the chart I use for form tap drill sizes.

 

See attached .PDF

FORM-TAP-DRILL-CHART.pdf