If you had to drill .13" x 3/4" deep holes without a drill...

[Brian H.]

...what would you do? I'd need a 1/8" bit with a 1/4" shank that was at least 3/4" long. Centurion tools doesn't make a spiral upcut that is long enough. They do, however, make a straight 1/8" x 3/4" bit with a 1/4" shank and a plunge bottom... do you see any issues with using that?


3hp Colombo Spindle
75 holes/piece
3-4 pieces per week
V-Carve Pro

[jimmya]

Do you have an 1/8” collet? If you do you can use a 1/8” drill bit and use the peck Drill.


Jimmy

[mims]

http://www.southeasttool.com/catalog/SEToolCatalog2010.pdf

They have what you want. Give them a call.

[Brian H.]

I like that... but the hole is just a bit larger than 1/8". It's 8ga. wire that has to fit into the hole. And there might have to be a little extra tolerance cut to slip in the wire. So... I'm not sure if a 1/8" bit would be right.

8-gauge wire has a diameter of 0.12849 inches. I think I'll do an experiment in the shop today. The 1/8" bit would be easy... but when does that happen?

[jerry_stanek]

try this place

http://www.hartlauer-bits.com/HartlauerBitsList.pdf

[Brian H.]

Thanks for the catalog links!

I've looked through both posted catalogs and I still have a hard time seeing a router bit that is less than 5/32 and is 3/4" long.

I'll go to the shop in a little bit and see what drill bit has the right tolerance. That's probably the next step.

8 gauge wire = 0.12849 inches
1/8" = .125
5/32" = .15625

Air drill and a 2nd Z would be nice, but there's absolutely no money for that right now. Plus, I've got a PRT Alpha from 2005.

[paul_z]

Brain,
If you have less than 100 holes to cut, I'd define a circle of 0.13 diameter. Using a 1/8" upcut spiral bit, create a pocket toolpath. I'd use a step down of about 1/8 inch per pass.
Contact http://precisebits.com (http://precisebits.com/). He’ll probably steer you toward MM208-1250-050F or something similar (without the ring).
Paul Z

[Brian H.]

Brain,
If you have less than 100 holes to cut, I'd define a circle of 0.13 diameter. Using a 1/8" upcut spiral bit, create a pocket toolpath. I'd use a step down of about 1/8 inch per pass.
Contact http://precisebits.com (http://precisebits.com/). He’ll probably steer you toward MM208-1250-050F or something similar (without the ring).
Paul Z

Well, ya, that's what I was thinking, too. BUT... that bit only has a .5" DOC (depth of cut). There's the catch. It needs to cut through a 3/4" MDF board.

[jerry_stanek]

would one of these Onsurd work for you

63-707
63-720

[steve4460]

Check out Roto Zip cutters they even have a 1/4 to 1/8 collet adapter , at your local Menards or Home depot .

[jerry_stanek]

I see you have a spindle You could get a 1/8 collet

[Brian H.]

Check out Roto Zip cutters they even have a 1/4 to 1/8 collet adapter , at your local Menards or Home depot .

Hey, Stephen! I'm going to assume you've done this... which is kind of exciting since I can do this without waiting for the UPS delivery. There must be a adapter that fits into the spindle collet... (thinking out loud) And you haven't had any issues???

btw... I believe I met you at one of the Shopbot get-togethers. I've moved to St. Cloud for non-business reasons. ...practically your neighbor. I'm kinda curious if there are other 'botters in the area.

[Brian H.]

I see you have a spindle You could get a 1/8 collet

Ya, that's good. Still haven't seen many 1/8" shank bits with 3/4" depth of cut in my usual shopping. Do you have a source?


The Onsrude cutter above works with the 1/4" collet. I'll look into that, too.

Thanks, everyone! I appreciate your help.

[paul_z]

You cut a hole deeper than the depth of cut by stepping down, but there must be enough clearance to eject the chips or cut in steps small enough that the bit will collect chips and spin them off the next time the bit is pulled up.
Another option might be to use the 1/8 bit to peck multiple times (1/8 inch at a time) like a drill bit and then use a pocket toolpath (again 1/8 step down per pass) to clean out the extra 0.05” (diameter).
Paul Z

[jimmya]

Try this bit

http://www.use-enco.com/CGI/INLMKD?SIITEM001=619-1199&SIQTY001=1&SICOUNT=1

Jimmy

[mitch_prest]

a number #30 drill is .1285


you might want to try that

[steve4460]

Hey, Stephen! I'm going to assume you've done this... which is kind of exciting since I can do this without waiting for the UPS delivery. There must be a adapter that fits into the spindle collet... (thinking out loud) And you haven't had any issues???

btw... I believe I met you at one of the Shopbot get-togethers. I've moved to St. Cloud for non-business reasons. ...practically your neighbor. I'm kinda curious if there are other 'botters in the area.

Yes ,I have . These cutter are cheep and so is the adapter .
Did you come out here to Hutchinson for that camp shopbot ?.
There is two bots here in town and a couple of them in the twin city's.
Let me know if your in town some day maybe we can get together to have a mini camp shopbot .