« previous next »
Pages: [1]   Go Down

Author Topic: New GUN DRILL  (Read 799 times)

0 Members and 1 Guest are viewing this topic.

Offline Cat Whisperer

  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 7493
  • Gender: Male
  • Pulaski Coehorn Works
New GUN DRILL
« on: February 16, 2005, 04:09:29 PM »
Got a brand new gun drill today (ebay $10 + $11 shipping).

I always wanted a good lubricant-through-the-bit drill.

This one's 1.18" in diameter.

[/url]

[/url]


Did I mention that it's 32" + long?
Logged
Tim K                 www.GBOCANNONS.COM
Cat Whisperer
Chief of Smoke, Pulaski Coehorn Works & Winery
U.S.Army Retired
N 37.05224  W 80.78133 (front door +/- 15 feet)

Offline GGaskill

  • Moderator
  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 5668
  • Gender: Male
Nice.
« Reply #1 on: February 16, 2005, 09:03:40 PM »
You know that the feed per revolution for one of those is .0005" or less?

And the oil operating pressure is 1000 psi?

And rpm is pretty high also.

And you need to bore a hole for it to start in.
Logged
GG
“If you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.”--Winston Churchill

Offline Cat Whisperer

  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 7493
  • Gender: Male
  • Pulaski Coehorn Works
New GUN DRILL
« Reply #2 on: February 17, 2005, 01:23:06 AM »
Didn't know any of that.  I just figured that I'd be able to get $21 worth of use from it.  I appreciate the info.  It is very likely, because it leaves only 6" of space on my 38" lathe, that I will severly modify it.  Probalby cut it to half the length (that suits the scale of stuff that I build) and make multiple heads for it - spade drills and boring heads.  It has a 1" shank which fits into my home-made boring bar holder well.
Logged
Tim K                 www.GBOCANNONS.COM
Cat Whisperer
Chief of Smoke, Pulaski Coehorn Works & Winery
U.S.Army Retired
N 37.05224  W 80.78133 (front door +/- 15 feet)

Offline Soot Sucker

  • Trade Count: (0)
  • Member
  • *
  • Posts: 53
New GUN DRILL
« Reply #3 on: February 17, 2005, 07:45:42 AM »
You got a great deal deal Cat...

There certainly are some great deals to be had on eBay. Sometimes you just have to do some seaching and hunting.

You did real good!


S.S.
Logged

Offline GGaskill

  • Moderator
  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 5668
  • Gender: Male
A couple more notes ...
« Reply #4 on: February 17, 2005, 08:52:12 AM »
The cutting oil is used to force the chips out of the hole, so the chips need to be very small (hence the low infeed rate) and the oil pressure high.  If the chips stick in the bore, the drill will likely twist off.  :-(  So don't skimp on the cutting oil pressure.

I would try to keep the drill at its original length and make a holder that allows me to choke up on the drill (hold it in the middle instead of the end.)
Logged
GG
“If you're not a liberal at 20, you have no heart; if you're not a conservative at 40, you have no brain.”--Winston Churchill

Offline Cat Whisperer

  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 7493
  • Gender: Male
  • Pulaski Coehorn Works
Re: A couple more notes ...
« Reply #5 on: February 17, 2005, 11:59:58 AM »
Quote from: GGaskill
The cutting oil is used to force the chips out of the hole, so the chips need to be very small (hence the low infeed rate) and the oil pressure high.  If the chips stick in the bore, the drill will likely twist off.  :-(  So don't skimp on the cutting oil pressure.

I would try to keep the drill at its original length and make a holder that allows me to choke up on the drill (hold it in the middle instead of the end.)


That is one option that I've been thinking about - as I have a bunch of 1144SP in 1.75" diameter (short lengths) - I may well make a collar that will slide on it, secured where I want it, and will fit one of my boring bar holders.

The other option is to make a changable head on it for spade drill bits and boring bar cutters.

In any event it will most likely end up being driven by a need of a project.
Logged
Tim K                 www.GBOCANNONS.COM
Cat Whisperer
Chief of Smoke, Pulaski Coehorn Works & Winery
U.S.Army Retired
N 37.05224  W 80.78133 (front door +/- 15 feet)

Offline Cat Whisperer

  • Trade Count: (2)
  • Senior Member
  • *****
  • Posts: 7493
  • Gender: Male
  • Pulaski Coehorn Works
New GUN DRILL
« Reply #6 on: February 17, 2005, 12:02:36 PM »
Quote from: Soot Sucker
You got a great deal deal Cat...

There certainly are some great deals to be had on eBay. Sometimes you just have to do some seaching and hunting.

You did real good!

S.S.


Thanks S.S. - I've been watching the tooling seciton in general from about 10minutes to an hour before closings.  That way I can pick off an item with NO other bids on it and get it for what I want to pay.  Takes about 45minutes three or four evenings a week.
Logged
Tim K                 www.GBOCANNONS.COM
Cat Whisperer
Chief of Smoke, Pulaski Coehorn Works & Winery
U.S.Army Retired
N 37.05224  W 80.78133 (front door +/- 15 feet)
Pages: [1]   Go Up
« previous next »