Question on drill bits??

[PILOON]

DORMER drill bits.
I purchased a set about 15 yrs ago as they were rated as the industry best around here.
Would you believe that in my usage (kinda recreational machenist, like most TBN's) that most have never been sharpened?
Trick is slow speed, cutting oil and moderate pressures.
The bigger the hole, the slower the speed.

Actually if you lack cutting oils even water to cool is better than nothing. The 'blacksmith/welder' guy I know always uses an old coke bottle of water to cool his bits and I think his bits date back to his grandfather.
On the otherhand his drill press also dates back to his grandfather- a big old hunking slow press with many reductions.

Dormer bits cost about 2X regular HS but, take it from me, they are tough.
1/2"hole in 5/8" stock is like a hot knife in butter. (well almost)

Not rocket science: quality bits+ cutting oil+ slow speed is the secret.

 

[PILOON]

DORMER drill bits.
I purchased a set about 15 yrs ago as they were rated as the industry best around here.
Would you believe that in my usage (kinda recreational machenist, like most TBN's) that most have never been sharpened?
Trick is slow speed, cutting oil and moderate pressures.
The bigger the hole, the slower the speed.

Actually if you lack cutting oils even water to cool is better than nothing. The 'blacksmith/welder' guy I know always uses an old coke bottle of water to cool his bits and I think his bits date back to his grandfather.
On the otherhand his drill press also dates back to his grandfather- a big old hunking slow press with many reductions.

Dormer bits cost about 2X regular HS but, take it from me, they are tough.
1/2"hole in 5/8" stock is like a hot knife in butter. (well almost)

Not rocket science: quality bits+ cutting oil+ slow speed is the secret.

 

[Farwell]

My father was a machinist and did a lot of work with stainless steel. His drill press would not go slow enough for him so he made a double pulley double fan belt conversion so his drill press would go under 300 rpm. The right type of drill bit, lubrication, slow speed and steady firm pressure worked most of the time. When I would try to drill stainless, before I talked to him, the drill bits would harden the stainless and the bit tips would be rounded of and dull enough to not be able to cut butter.
Farwell

 

[Farwell]

My father was a machinist and did a lot of work with stainless steel. His drill press would not go slow enough for him so he made a double pulley double fan belt conversion so his drill press would go under 300 rpm. The right type of drill bit, lubrication, slow speed and steady firm pressure worked most of the time. When I would try to drill stainless, before I talked to him, the drill bits would harden the stainless and the bit tips would be rounded of and dull enough to not be able to cut butter.
Farwell

 

[Bluecheck546]

a. use sharp drill bit
b. use slow rpm as the machine allow
c. (push) feed hard
d. keep the drill bit cool

Remember, the shawings should be in brown color, it they are blue you turning the toolbit to high of a rpm. Only carbide tools are made to be use on higher rpm range, but all tools need a proper tool pressure to last long. By feeding hard you removing a thisker chiip shawing and with it removing heat as well. Hope this helps someone.

 

[Bluecheck546]

a. use sharp drill bit
b. use slow rpm as the machine allow
c. (push) feed hard
d. keep the drill bit cool

Remember, the shawings should be in brown color, it they are blue you turning the toolbit to high of a rpm. Only carbide tools are made to be use on higher rpm range, but all tools need a proper tool pressure to last long. By feeding hard you removing a thisker chiip shawing and with it removing heat as well. Hope this helps someone.

 

[Bird]

Apparently that must be a common problem with drill presses. I used to have a relatively cheap drill press from Tractor Supply Co.; 5-speeds, I never used anything but the slowest speed and it was still too fast.

 

[Bird]

Apparently that must be a common problem with drill presses. I used to have a relatively cheap drill press from Tractor Supply Co.; 5-speeds, I never used anything but the slowest speed and it was still too fast.

 

[bobodu]

</font><font color="blue" class="small">( By feeding hard you removing a thisker chiip shawing and with it removing heat as well. Hope this helps someone. )</font>



Huh???


Whiskered chimp thawing?
This here hip pshawing?
Thicker chip shaving??

I've tried and tried....and I put my money on the third guess....hate that when that happens... Mom tells me it's gonna get worse as I get older....

 

[bobodu]

</font><font color="blue" class="small">( By feeding hard you removing a thisker chiip shawing and with it removing heat as well. Hope this helps someone. )</font>



Huh???


Whiskered chimp thawing?
This here hip pshawing?
Thicker chip shaving??

I've tried and tried....and I put my money on the third guess....hate that when that happens... Mom tells me it's gonna get worse as I get older....