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Drilling long holes through tough steel has always been a pain - But my Tormach make it so much easier. For this work G83 is a Godsend.
I use a simple split bush to hold a 8.0mm long series drill direct in the R8 to gain max room.
Feel free to post any info you have on deep hole drilling - cheers.
Very nice, Keen. Are there guidelines for when to use G83 vs. G81? I always use G83 (full retract) whenever a hole is more than about 2 diameters deep in all metals but don't know if that is really necessary.
Randy
i get some great ideas every time i click on this forum. i wish i saw that a few weeks ago. i was trying to drill a large diameter part on the 4th axis and didn't have a stub length drill in the size i needed. i could have saved a bunch of length by ditching the chuck and using your bushing idea.
thanks for posting.
Am I missing something here. Why not just use an 8mm R8 collet. Assuming you have one, which if you don't then shame on you.;)
Phil:)
PS: It's a bit dodgy gripping a drill bit on anything othet than the plain shank.
Quote:
Originally Posted by 300sniper
Phil, keen is gripping the drill bit on the plain shank. You can see that the flutes stop well below the split bushing. ;) But also a split bushing withstands the torque of the axis stepper motors, so keen's application seems safe to me.Quote:
Originally Posted by philbur
And I'm not keen (much to his relief, I'm sure!) but I own two R8 collets. I grumbled about buying the 5/8", but needed it to hold a dovetail cutter that I couldn't find in a 3/4" shank to hold in the Tormach's standard collet.
Randy
I wasn't referring to Keen. I guess I missunderstood you intention regarding the need for a stub drill.
Phil:)
Quote:
Originally Posted by zephyr9900
I understand, Phil. But my point was that with a Tormach, there is hardly ever a need for anything but the single R8 collet that comes with the machine. Mark me down on the list of people who thinks keen's split bushing for a one-time use was very clever.
Randy
i am like you randy. i only have my 3/4" r8 collet. i keep saying i will buy a set but haven't gotten around to it.Quote:
Originally Posted by zephyr9900
i like keen's idea because when in a situation like when i needed to drill something NOW and i didn't have enough room in the z, i could run over to the lathe and make a split bushing in just a few minutes. that is much faster than running home, getting online and ordering either the correct collet or stub drill and then waiting for it to arrive.
i am also thinking even if i ordered a set of r8 collets, i'm not going to have one for every drill size, letter, number and fraction.
hi Phil - The split bush is 3/4" and works as as a TTS quick change (height set offline and set for level flush with the bottom of bush for measurement and installation - good enough for drilling depth) - also I only have a couple of R8 collets - not that size.
Hi Randy - yes I use G83 from about 2 diameters down also. Best to be conservative so the machine can run unattended. I use a short peck also - 2mm keeps the swarf short and avoids untangling attention.
Cheers.
Can't believe you guys have got a $7,500 + machine and don't have a set of either R8 collets or an ER collet chuck (TTS even) and a full collet set, or both.(chair)
Phil:)
Phil -
I don't remember them saying they didn't have ER collet holders. The TTS ER holder is pretty long, so it wouldn't work for holding an extended drill anyway.
I'm with them; I own exactly one R8 collet. I never got around to buying a set, and so far I haven't missed it either. On the other hand, I don't have enough ER holders, and would like to get more.
Keen -
Thanks for posting the idea. I'll keep it in my back pocket.
Regards,
- Just Gary
Cheers - Ive got 3 TTS ER holders - and a bundle of collets. Enough for most jobs - usually only 2 or 3 tool changes per set up.
Yes the ER TTS was too long to hold the drill - I had the spindle almost touching the top of the job.