[twocik]

I have a few things coming up that require a 1" drill & 1.25" drill. I've been looking at insert drills, but just not sure the Tormach can handle something that big.

Has anyone here drilled anything that big on a Tormach ? If so can you please post what was used (link, picture).

[BAMCNC.COM]

Why not use a boring bar, or use progressively bigger drill bits. I've done it on a SX2 so I know its possible.

[Runner4404spd]

your going to need +5-7hp to push that large of an insert drill in steel with the feeds and speeds they recommend. if the material is soft like aluminum, then use stanard steel drills.

[keebler303]

maybe you can interpolate the holes as an alternative? Depends on how deep they are.

Matt

[twocik]

These parts are going to made from 6061-T6. I like using drills to remove lots of material fast and have been using 1/2" & 3/4" drills already, just thought I might be able to shorten my machine time using a larger drill.


"if the material is soft like aluminum, then use stanard steel drills."

For aluminum I use parabolic and they work very well. Curious why you'd use steel twist drills for aluminum ?



"interpolate the holes"

Yes, I normally use a 1/2" EM for most of my larger helix interpolation work and have a 3/4" TTS conversion going now. A drill is just faster.

[Don Clement]

I use an annular cutter for holes up to 2” deep (4” deep if I can turn the part around.) with my 1.5HP lathe. Here is a 1-15/16” diameter annular cutter with ¾” shaft held in a 5C bar on my lathe. BTW I finish the 2” diameter hole to size using an insert boring bar. However for making large holes with my Tormach I trepan using a 1/2" EM.

Don