Tapping problems

[ATG]

I'm having problems tapping. I use the rigid tapping with a fadal 6535 with the 32mp control. I'm trying to tap a 1"-8 tap 1/2 deep into hot roll plate burnt out Blanchard ground and normalized. No luck (Spindle motor overload fault). I'm pretty sure the sales guy for fadal said I could tap up to 1.250 taps.........Should I be thinking about thread milling instead. I would like to tap all the way through the 1.5" plate but I would settle for 1/2 and then hand tap the plates the rest of the way..........

 

I'm using a Morse 1"-8 tap

 

 

Any suggestions

[spade117]

Are you using coolant or oil?

 

If going halfway is ok, just program it to not go as deep.

[spade117]

Oh...what rpm and feedrate are you using?

[ATG]

Right now I’m only trying to go halfway and I’m overloading the motor. I'm running 200 rpms with a feed rate of .125 per rev. or the pitch of the tap............

[?Mark]

quote:

---

I'm pretty sure the sales guy for fadal said I could tap up to 1.250 taps

---

I bet he did

 

My daily driver here is a 50 taper mori, but for this size of thread I'd just thread mill it. Nice and easy...

 

hth

[Mcam Nut]

Did you try to peck tap? are you using a machine tap? make sure it is a taper tap, not a plug, and if that dont work go to a threadmill

[Guest]

quote:

---

but for this size of thread I'd just thread mill it. Nice and easy...

---

+1 Mark

 

Salesman said on Fadal, ROFLMAO

 

Sounds like a major case of buyer beware

[HEAVY METAL]

i thread mill anything over a inch.

[Rick Henrickson 65]

ah yeah, salesman are full of crap.

threadmill is your only choice!

1.25 tap in plastic maybe!

[masterp]

I am currently running 1" 8unc tap 1 1/2 deep in 1045 steel. 100 rpm, trim tap heavy fluid. tension/compression holder. Blind hole .5 deeper than needed for chips. Using Tin coated hand tap.

My boss will not buy spiral flute taps for blind holes. This is a repeat job, i have zero problems tapping. running on a Mori MV55.

[ATG]

Thanks guys, any suggestion on tooling for thread milling I’ve really never gotten into it.

 

Solid carbide over index able what brand anything to look out for......

 

Thanks again

 

Seth

[Thee Dragracer1951]

Just as an aside...have you looked at the torque curve for your machine? Might be not enough RPM to get into the bigger torque numbers

[Moldmaker74]

I typically buy single point threadmills. They are cheeper than full form tools plus you can use it on any thread pitch.

[Guest]

I only use single points for rare threads

 

They take longer to generate a cycle since the entire length of the thread must be cut, where as the multiple flute cutters go around the hole once and cut the entire thread in 1 pass.

[Rick Henrickson 65]

look at harvey tool