Machine Tapping on a Jet JMD-18

[jdunmyer]

Jim C,
Thanks for the feedback!

I consider a "small tap" to be something smaller than, say 6-32. Doing those under power makes me a bit nervous sometimes, but if it's a through hole and easy tapping (cast iron, perhaps), I'll do 'em anyway.

Yes, I have backgear and usually use it for tapping. Again, if it's a small hole and going well, I'll sometimes leave it in direct, but slowed way down with the VFD. As in <200 Rpm.

My quill works very easily, so I can feel pressure pretty well in both directions. I sorta "help" it at the beginning of threading and the end of backing out. The threads always look to be OK, so I'm not going to worry about it.

<<Jim>>

[RancherBill]

Wiring Diagram

I looked up your wiring diagram. It is on page 29 of this manual.

Jet JMD-18

http://www.misgroupinc.com/partfiles/M-350020.pdf

This has all the information necessary for someone who is more competent than I am to give you a recomendation.

You should post the exact model of motor that is on the machine.

Hope this is helpful.

[KDRedd]

Machine Tapping

I have a 2 hp single Phase table top ENCO I use for tapping all the time. Most are thru hole. I turn the tap slow, 85 to 150 rpm, let the spindle stop and then reverse.

Kent