wtb gundrill

B

buell

AzB Silver Member
Silver Member
i am looking for a gundrill with a diameter of 18mm and a side air fitting on a cue-smith lathe.

thanks for looking
 
Would not say they will last forever as I have had 2 Sterling gun drills that have broken while drilling. Carbide tips shattered while cutting with 35 psi and 800 rpm @ 3 inches a minute into gaboon ebony. After the first broke I bought 2 of them the same size in case it happed again which it did.

The second one broke while drilling dymondwood.
 
Brickcues said:
Would not say they will last forever as I have had 2 Sterling gun drills that have broken while drilling. Carbide tips shattered while cutting with 35 psi and 800 rpm @ 3 inches a minute into gaboon ebony. After the first broke I bought 2 of them the same size in case it happed again which it did.

The second one broke while drilling dymondwood.
Click to expand...

I could be absolutely wrong but about the only way that I can see breaking one of these, let alone two would be from operator error. It sounds like a heat problem. The speed and feed rate sound as though they should be okay. I don't know about the air however. I have a valve limiting the amount of air being supplied but my compressor can maintain 110 lb. of pressure and 13 cft/m if needed. I adjust the air so that the drill stays cool and I can easily lay my face against it while in operation. If your alignment set-up is not correct, the drill would be in a bind while boring causing much increased heat.

This may not be the problem but if it was me I would be checking it out. I would say that I have probably bored 800-1,000 pieces of hardwood with "0" problems using a .750 Sterling gun/drill.

Dick
 
Brickcues said:
Would not say they will last forever as I have had 2 Sterling gun drills that have broken while drilling. Carbide tips shattered while cutting with 35 psi and 800 rpm @ 3 inches a minute into gaboon ebony. After the first broke I bought 2 of them the same size in case it happed again which it did.

The second one broke while drilling dymondwood.
Click to expand...

What did Sterling say??
 
Brickcues said:
Would not say they will last forever as I have had 2 Sterling gun drills that have broken while drilling. Carbide tips shattered while cutting with 35 psi and 800 rpm @ 3 inches a minute into gaboon ebony. After the first broke I bought 2 of them the same size in case it happed again which it did.

The second one broke while drilling dymondwood.
Click to expand...

I have never heard of anyone breaking one of these, after all.... they drill metal too.

The drills were defective...... no matter what you do, you can't break one drilling wood, even ebony.

Kim
 
Brickcues said:
Would not say they will last forever as I have had 2 Sterling gun drills that have broken while drilling. Carbide tips shattered while cutting with 35 psi and 800 rpm @ 3 inches a minute into gaboon ebony. After the first broke I bought 2 of them the same size in case it happed again which it did.

The second one broke while drilling dymondwood.
Click to expand...

When gun drilling metal we use as much pressure as available from the coolant pump(aprox 120 pis)

When I gundrill wood, I use 80 psi, no problems so far. I only drill maple and some NZ native woods.
 
I guess I should have said it was the same bit. The first time it chipped the carbide at the tip and Sterling ground it off and then reshaped it. The second time the tip broke into several pieces. It was a .625 bit, have never had any problem with .750 or .875. and I have done alot of cores. It was probably a bad piece of carbide as I have another .625 that I have never had a problem with.
 
rhncue said:
I could be absolutely wrong but about the only way that I can see breaking one of these, let alone two would be from operator error. It sounds like a heat problem. The speed and feed rate sound as though they should be okay. I don't know about the air however. I have a valve limiting the amount of air being supplied but my compressor can maintain 110 lb. of pressure and 13 cft/m if needed. I adjust the air so that the drill stays cool and I can easily lay my face against it while in operation. If your alignment set-up is not correct, the drill would be in a bind while boring causing much increased heat.

This may not be the problem but if it was me I would be checking it out. I would say that I have probably bored 800-1,000 pieces of hardwood with "0" problems using a .750 Sterling gun/drill.

Dick
Click to expand...

Dick, I gotta ask, what are you doing using your face for a steady rest?

LOL. Jim.
 
Gun Drill

A lot of cuemakers are hands on, Dick is Face on.
I've done some stupid things with mine and it's held up fine.
I might ask, why mm not inches.
 
18mm is a fairly common size, in the metric world that is.
18mm = .708"
Some may feel that 3/4"(.750) is a bit too large.
18mm is a bit less too large.

KJ
 
I use 2 different sizes , I use a .670 from the A joint to threw the forarm and .750 out the back . I cut my dowell 30" and do the forarm 1st and then turn the dowell down to .750 and fo the rear of the cue . Never broke a gun drill yet . I buy them off e-bay and install the air fitting . Jim
 
KJ Cues said:
18mm is a fairly common size, in the metric world that is.
18mm = .708"
Some may feel that 3/4"(.750) is a bit too large.
18mm is a bit less too large.

KJ
Click to expand...

I've always been of the opinion that if I'm coring for a reason, I might as well really core. But that's just my 2 cents.
 
cutter said:
A lot of cuemakers are hands on, Dick is Face on.
I've done some stupid things with mine and it's held up fine.
I might ask, why mm not inches.
Click to expand...

I read your post quick and thought you called someone a Dickface.
 
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