fear of tapping

[motodog]

old school voodoo, new school voodo. its all good.

The important thing is that I'm surrounded by witch doctors.

Somehow I doubt that I'd get this kinda help at the dell users forum!

 

"pingggg-scritch".

 

"Have you tried re-booting your computer? Shutting it off?"

 

I've got a friend that swears by his homemade mini drillpress for tapping, but he whines when I borrow it....

[chris m]

I run OSG Hy-Pro Tin form taps in softer materials with great success and use their ExoTap in harder materials [440C, 4340, 17-4PH].

 

For your application I'd start with 606RPM and hold the tap in a collet chuck.

 

Test with a bigger drill, like an M, and see if the minor dia is OK; if not I think the 7.4mm is a good suggestion.

 

Coolant only

 

Try picking the R point up to about .200 or so above the surface to let the machine build RPM before it hits the piece

 

C

[Guest CNC Apps Guy 1]

quote:

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...Somehow I doubt that I'd get this kinda help at the dell users forum!...

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ROFL..... I'm pretty sure you're right on that account.

 

quote:

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...old school voodoo, new school voodo. its all good.

The important thing is that I'm surrounded by witch doctors...

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That's hilarious!!!!!!

 

This place does rock!

[Bill K]

To get the RPM try this : 1/number of threads = thread pich. then / feed rate you want by the pich, and get the rpm's

in other words a 3/8 16 thread = 1/16 = 0.0625 the pich of 3/8 16 thread. Now take the feed rate you want and / this by the pich, and get a rpm of 80

Do a search on the web for tap drill sizes.

Use a cutting oil ( tap magic )

[robk]

Sorry Bill, but I have to disagree with you.

Those RPM's are nowhere near where thay should be for aluminum. A lot of machines can't even run that low. The RPM's on our 12K spindles don't go any lower than 200. Also IMO using tapping oil is a bad idea. Coolant contamination is one issue, and chips sticking to the tool is another. Coolant only.

[Charlie Pierson]

I start my tapping feeds at about 25-30 ipm.

Use some sort of lubrication so that the aluminum

doesn't gall the tap. If possible I use a roll tap w/ an axial groove in it so as to relieve hydraulic pressure formed when coolant in the hole has nowhere to go to exit the hole (Jarvis's

Jar-Flow type taps). As far as the depth goes, just go for it or, if your machine can peck tap (Fanuc G84 cycle w/ a Q in it )

[CAM-mando]

FOR GOD SAKES MOTO JUST TAP THE DAMN HOLE ALREADY

[Jack Mitchell]

+1 CAM

 

Regards, Jack

[motodog]

Just got the taps.

They're so shiny, I don't want to scuff em up.

[Harryman]

Dude, they won't scuff.

 

POUND EM HOME!

 

Form tapping 6061 is like butta.

[Lars Christensen]

I am going to try some 1.6X.3mm in some S304 monday or tuesday, giving that form thread a try.

[Gary]

Hey with all this talk about how to do the job but not actually doing it we are either in the engineers office or running for office. lol (sorry couldn't help it.)

[motodog]

Thats the problem...I had too much time to research.

I've only been doing cnc for about 3 months now and still get cold feet every now and then.

 

Thanks again. I'm using the S508/F25 with the M drill. Its a spot sloppy but hey. Its really f'ing fast and predictable.

 

I guess now I'm a pro.... I've done it once.

[TheePres]

Sir,

The Hass has a peck tapping cycle that works very nice on deep hole tapping.

[one shot]

Forget the cold feet.

Punch it and pray!

[MACHINEMASTERG]

quote:

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Sir,

The Hass has a peck tapping cycle that works very nice on deep hole tapping.

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it does ???we dont have it here is this a new feature what level software do you have in your controller ???how old is this machine id love to have peck tapping!!!

[medaq]

I am really suprised about all the people tapping so slow and using cut taps to do it, Especially in aluminum.

 

I guess I am to much into a production enviroment to not tap at my machines max capacity of 3000.

 

Even prototype I still tap at a fast speed rate. If the numbers you have in the control are bad, well it will break the tap at 500 rpm or 3000 rpm. And feed hold works on very few machines if you had bad numbers.

 

 

Jim

[kccadcam]

quote:

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I am really suprised about all the people tapping so slow and using cut taps to do it, Especially in aluminum.

 

I guess I am to much into a production enviroment to not tap at my machines max capacity of 3000.

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+1

[Roger Peterson]

2 things and I'll go away:

 

1. don't ever use a spiral fluted tap in aluminum. It's not that they don't work in aluminum but if you ever break one your in for some fun. I use them all the time in steel.

 

2. Roll form aluminum, period. You will probably have to increase your coolant mixture a bit, I try to stay away from cutting oils as much as possible. There are some water soluable tapping fluids that won't contaminate as much as molly dee. Your coolant mfg should give you a percentage to shoot for when tapping/roll forming.

[Tim Johnson]

The speeds surprise me too. I rolltap an M8-1.25 at 2911 rpm (240 sfm).

[McRae]

>>I've only been doing cnc for about 3 months now and still get cold feet every now and then.

 

Don't worry about it, there is nothing those factory service guys can't fix - the trick is to fool them into a warrenty claim...

[CAM-mando]

quote:

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Don't worry about it, there is nothing those factory service guys can't fix

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LMAO ... that is awesome encouragement.

[TheePres]

been in this field a lil over 20 yrs, and still pucker up as tap approaches work piece.

[Sharon]

I have to agree with Harryman about the 6061. I use it for all tests and it is easy to tap. I have a VF-0 and we use G84. Use peck whenever you can, I find that it stops a lot of problems with deep holes.

The cold feet thing will go away - just takes a little time. Good luck!

[Sharon]

I have to agree with Harryman about the 6061. I use it for all tests and it is easy to tap. I have a VF-0 and we use G84. Use peck whenever you can, I find that it stops a lot of problems with deep holes.

The cold feet thing will go away - just takes a little time. Good luck!