- posted
11 years ago
Does anyone know, what is the biggest N.C tap that I could safely use
for rigid tapping (maybe with a floating tap holder), without
jeopardising gearing and such, of the head, due to tapping torque?
i
Bridgeport Interact 2 tapping capacity
Does anyone know, what is the biggest N.C tap that I could safely use
for rigid tapping (maybe with a floating tap holder), without
jeopardising gearing and such, of the head, due to tapping torque?
i
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- posted
11 years ago
With the 2-3 HP motor, variable pitch drive and back gear, I'd expect
you have available torque for tapping far larger than anything you're
likely to want to do. The Interact may not have been designed for rigid
tapping, but it was expected to be used with tapping heads, and I don't
think the torque requirements are any different for those.
- posted
11 years ago
Say, would 3/4" NC be an issue? This is the biggest thread I had to
tap to date.
i
i
- posted
11 years ago
I would think 3/4" would be fine in normal materials. I think your gears
are probably not the weak link, and your vari-belt drive would likely
slip before you could damage the gears. This does bring up the question
of whether you have wired your VFD alarm output into your E-stop circuit
so the mill will E-stop if the VFD trips on overload, etc. vs. trying to
push a non-rotating end mill through the material and eventually
tripping on a following error.
- posted
11 years ago
I would suspect that in back gear you could handle 1/2" threads.
Anything larger, I would look into thread milling anyway -- less stress
on the machine, and more thread pitches possible with a single cut
thread mill. Of course, with a multi-cut one, you could mill the thread
in a single pass around the hole, but the mill would be good only for a
single specific pitch.
Good luck, DoN.
Good luck, DoN.
- posted
11 years ago
Ive tapped 1 1/4-8 on the Gorton with no issues in low gear. Just
chugged right along.
One of these days Ill take out a big tap and see how big I can go.
Btw..the Gorton spindle is 3hp.
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)
One of these days Ill take out a big tap and see how big I can go.
Btw..the Gorton spindle is 3hp.
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)
- posted
11 years ago
Piece of cake. Lube well, drill the proper pilot hole, dump it into low
gear and voila!
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)
- posted
11 years ago
For me, the weak link is holding the tap. I just bought another 1" NPT
on ebay. The last one spun in the TG100 collet holder with bad
results. I do all tapping in back gear on my excello knee mill.
karl
karl
- posted
11 years ago
Ayup. I do everything over 5/8ths in holders. Ive had Stuff move in my
collets. My Gorton is NMTB 30 but Ive got a set of collets up to 7/8ths.
And a nearly full set of tool holders.
Ive not tried the Abene yet for tapping. Its got a 4hp motor and a very good gearbox..I can drop down to 28 rpm..which should provide a SHITLOAD of torque.
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)
Ive not tried the Abene yet for tapping. Its got a 4hp motor and a very good gearbox..I can drop down to 28 rpm..which should provide a SHITLOAD of torque.
Gunner
I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)