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Posted by Will on October 30, 2007, 10:09 pm
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>I will give that a try if I can't find the ammonium version. I have some
>pipe flux with zinc chloride but it is only 8%.
>
> --
> Glenn Ashmore
Don't forget, you can make your own (much stronger) by killing some
hydrochloric acid with a handful of zinc. (I presume you have zinc lying
around if you're galvanising stuff.) Otherwise use scrap galvanised steel.
Cheers
--
Jeff R.
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Posted by Will on October 30, 2007, 10:43 pm
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> depends what diameter drill your spinning, but metal drilling needs to go
> slower than wood.
> bigger drills, more slower, once you go past 1/2" dia. drilling in metal,
> you really need to slow down. Drill presses made for woodworking are
> generally unsuitable for holes in metal larger than 1/4" dia, unless you
> like sharpening & replacing drill bits alot.
That is great information. What are the specific characteristics I should
call out? 1/4 to 1/2 inch diameters would be a very typical range for us.
--
Will
>> Should a drill press used for drilling holes through 1/4 inch stainless
>> steel have any different characteristics than a drill press used for wood
>> work? Our applications are fairly trivial: maybe once a month we would
>> need to drill new screw placement holes in thick stainless retaining
>> plates. So we need a small drill press, but I want to make sure we don't
>> overlook any specific characteristics that a drill press intended for
>> metal use should have.
>>
>> --
>> Will
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Posted by Randy Zimmerman on October 30, 2007, 11:00 pm
Please log in for more thread options For a half inch drill bit in stainless you want a drill press that will go
as slow as 300 rpm. Most better quality woodworking drill presses can go
that slow.
A gearbox driven drill press gets very expensive but for half inch and
less you could get by with a vee belt driven drill press.
1/3 horsepower motor would be on the weak side.. look for an honest half
horsepower motor.
Randy
>> depends what diameter drill your spinning, but metal drilling needs to go
>> slower than wood.
>> bigger drills, more slower, once you go past 1/2" dia. drilling in metal,
>> you really need to slow down. Drill presses made for woodworking are
>> generally unsuitable for holes in metal larger than 1/4" dia, unless you
>> like sharpening & replacing drill bits alot.
>
> That is great information. What are the specific characteristics I
> should call out? 1/4 to 1/2 inch diameters would be a very typical range
> for us.
>
> --
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Posted by Ed Huntress on October 30, 2007, 10:51 pm
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> depends what diameter drill your spinning, but metal drilling needs to go
> slower than wood.
> bigger drills, more slower, once you go past 1/2" dia. drilling in metal,
> you really need to slow down. Drill presses made for woodworking are
> generally unsuitable for holes in metal larger than 1/4" dia, unless you
> like sharpening & replacing drill bits alot.
Drilling "thick" stainless, you have no chance in hell with a drill press
that runs at woodworking speeds. You'll burn every bit even at the low speed
end. Also, you have little chance with 1/4" bits in "thick" stainless unless
you have a pretty rigid drill press that can run at very moderate
metalworking speeds. Somebody here will know the specific RPM, but it's 'way
down there.
A drill press that will cover the appropriate speeds for both is a not very
common. My floor model 50-year-old Walker-Turner, which is belt-driven, will
just do it, but it's because I have the intermediate pulley ("third wheel")
option for it. It's just barely rigid enough for drilling stainless with a
1/4" bit, partly because I had a lot of experience drilling many hundreds --
probably thousands -- of stainless pieces when I worked in a shop. It
requires some practice to keep adequate pressure on the bit without
springing the whole affair or slipping the belt, unless the drill press is a
heavy industrial model. If you don't keep adequate pressure (feed pressure,
that is) on it, you'll work-harden the stainless, burn the bit, and make it
extremely difficult to get the hole re-started.
The best bet in a commercial setting is to have one drill press appropriate
for each task. In fact, I prefer drilling thick stainless in a Bridgeport or
other mill.
--
Ed Huntress
>
>
>> Should a drill press used for drilling holes through 1/4 inch stainless
>> steel have any different characteristics than a drill press used for wood
>> work? Our applications are fairly trivial: maybe once a month we would
>> need to drill new screw placement holes in thick stainless retaining
>> plates. So we need a small drill press, but I want to make sure we don't
>> overlook any specific characteristics that a drill press intended for
>> metal use should have.
>>
>> --
>> Will
>>
>>
>
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Posted by Richard J Kinch on October 30, 2007, 10:59 pm
Please log in for more thread options Ed Huntress writes:
> A drill press that will cover the appropriate speeds for both is a not
> very common.
My Delta woodworking drill press goes down to 250 rpm. Home Depot item
from about 1996, with a 3-pulley system and 1720 rpm motor.
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>pipe flux with zinc chloride but it is only 8%.
>
> --
> Glenn Ashmore