CamBam
News:
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
February 25, 2020, 08:05:44 am


Login with username, password and session length


Pages: [1]
  Print  
Author Topic: Can't (yet) find the drill I need.  (Read 900 times)
lloydsp
CNC Jedi
*****
Offline Offline

Posts: 8140



View Profile
« on: November 21, 2019, 20:57:17 pm »

I need a 0.5" x 118-degree standard 'twist drill' (for metal), short (2.5") would be nice though not absolutely necessary, AND with a 1/8" pilot point at least 0.040" long on its vertical sides.

All I've been able to find in pilot drills offer a FLAT full-diameter face, instead of the 118-degree tip.

Having one (and a source for more) would save me over 40 minutes - by eliminating a MOp - on a job I'll be doing repetitively over the next three years.

Thanks, all.

Lloyd
Logged

"Pyro for Fun and Profit for More Than Fifty Years"
EddyCurrent
CNC Jedi
*****
Offline Offline

Posts: 4144



View Profile
« Reply #1 on: November 21, 2019, 21:09:09 pm »

Is this the kind of thing ? https://www.mcmaster.com/countersink-drill-bits
Logged

Made in England
lloydsp
CNC Jedi
*****
Offline Offline

Posts: 8140



View Profile
« Reply #2 on: November 21, 2019, 21:18:26 pm »

Well, Eddy,

Yes, "like" those, but with a 1/8" diameter pilot, rather than 'screw or tap' sizes.  What I'm doing is drilling a 1/2" hole, then penetrating the bottom with an 1/8" drill in order to open a path to features milled on the bottom of the board.

But the major hole must be 1/2" with 118-degree tip, and the pilot must be 1/8" in diameter.

Thanks,
Lloyd
Logged

"Pyro for Fun and Profit for More Than Fifty Years"
kvom
CNC Jedi
*****
Offline Offline

Posts: 1546


View Profile
« Reply #3 on: November 22, 2019, 00:30:02 am »

Take stub length 1/2" drill bit.  Mount in lathe and drill 1/8" through hole using carbide drill bit.  loctite desired length of 1/8" drill bit in the tip.   Huh
Logged
lloydsp
CNC Jedi
*****
Offline Offline

Posts: 8140



View Profile
« Reply #4 on: November 22, 2019, 00:58:39 am »

Kvom,
Have YOU ever tried drilling a hole in the nose-end of a hardened 118-degree twist drill?  I mean, really.

I'd rather have one 'custom ground' than to try to modify a good-quality drill!

Lloyd
Logged

"Pyro for Fun and Profit for More Than Fifty Years"
dave benson
CNC Jedi
*****
Offline Offline

Posts: 1267


View Profile
« Reply #5 on: November 22, 2019, 01:56:25 am »

Lloyd
search for pilot bore countersink's
Dave
Logged
Bob La Londe
CNC Jedi
*****
Offline Offline

Posts: 3859


^ 8.5 pounds on my own hand poured bait.


View Profile WWW
« Reply #6 on: November 22, 2019, 01:57:49 am »

Depending on what it is a shop ground D-bit might do the trick.  I have a few pieces of W2 laying around the shop for stuff like this.  
Logged

Getting started on CNC?  In or passing through my area?
If I have the time I'll be glad to show you a little in my shop. 

Some Stuff I Make with CamBam
http://www.CNCMOLDS.com
Garyhlucas
CNC Jedi
*****
Offline Offline

Posts: 1336


View Profile
« Reply #7 on: November 22, 2019, 02:08:44 am »

Lloyd,
The type of drill you want is called a subland drill. Look at 29475A81 at McMaster Carr. OD and angle are what you want but tip is oversize. You might be able to have one made as a special.  These are short too.
Logged

Gary H. Lucas

Have you read my blog?
 http://a-little-business.blogspot.com/
lloydsp
CNC Jedi
*****
Offline Offline

Posts: 8140



View Profile
« Reply #8 on: November 22, 2019, 02:13:22 am »

Yep, Gary.  I've already contacted a 'custom grinder' who will make such a bit for about $40 USD, onesies.

I'm betting they'd be closer to $30 USD each, if I bought five.  But FIRST, I'll test one on the job. <grin>

Lloyd
Logged

"Pyro for Fun and Profit for More Than Fifty Years"
dave benson
CNC Jedi
*****
Offline Offline

Posts: 1267


View Profile
« Reply #9 on: November 22, 2019, 02:24:28 am »

Lloyd this is what I was thinking of.
This is a cheap one, but you can get them with a hollow shaft and used with a panel drill allows you to set the
Depth of the pilot drill, the ones I've used for metal working come in 120 deg which may be close enough and they are quite inexpensive.
Dave


* pilotbore countersinks.PNG (27.64 KB, 538x110 - viewed 41 times.)
Logged
lloydsp
CNC Jedi
*****
Offline Offline

Posts: 8140



View Profile
« Reply #10 on: November 22, 2019, 11:44:54 am »

Thanks, Dave.

Lloyd
Logged

"Pyro for Fun and Profit for More Than Fifty Years"
kvom
CNC Jedi
*****
Offline Offline

Posts: 1546


View Profile
« Reply #11 on: November 22, 2019, 13:46:46 pm »

Kvom,
Have YOU ever tried drilling a hole in the nose-end of a hardened 118-degree twist drill?  I mean, really.

I'd rather have one 'custom ground' than to try to modify a good-quality drill!

Lloyd

I intended the drilling to start from the flat  end of the drill.  But since a custom grind is so cheap that's the way to go.
Logged
Bob La Londe
CNC Jedi
*****
Offline Offline

Posts: 3859


^ 8.5 pounds on my own hand poured bait.


View Profile WWW
« Reply #12 on: November 22, 2019, 16:48:54 pm »

That's pretty reasonable for a custom ground drill.  Often for me its one of those things where I need to do it NOW which is why I sometimes make tools instead of waiting for them. 
Logged

Getting started on CNC?  In or passing through my area?
If I have the time I'll be glad to show you a little in my shop. 

Some Stuff I Make with CamBam
http://www.CNCMOLDS.com
Garyhlucas
CNC Jedi
*****
Offline Offline

Posts: 1336


View Profile
« Reply #13 on: November 22, 2019, 23:28:03 pm »

$40 sounds like a deal if you save 40 minutes each time. I had a carbide router bit made for producing 20 degree angled flanges that mate with Ag ball valves and sanitary flanges too. One tool does 3 different operations in one pass each and no tool changes. Huge time saver and improved part quality at the same time.
Logged

Gary H. Lucas

Have you read my blog?
 http://a-little-business.blogspot.com/
Pages: [1]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines

Valid XHTML 1.0! Valid CSS! Dilber MC Theme by HarzeM
Page created in 0.158 seconds with 20 queries.

Copyright © 2018 HexRay Ltd. | Sitemap