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Unread 24-11-2014, 11:45
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Re: One tool/machine to level up a moderate shop

Count me as a mentor who has been pleased with a cold saw.

We've been cutting (yes it is slow) aluminum for a couple of seasons without injury. We did break a blade once when the stock was not long enough to clamp properly. Because of the low rpm the incident was alarming and instructive but not particularly dangerous.

I will accept slow cuts, and higher upfront cost, to avoid the hazard (see other CD posts for scary stories of flying metal) of having anyone, especially students, cut metal with a high-speed chop saw. Not to mention the screeching.

A pneumatic rivet gun set up is relatively cheap and as posted earlier a great next tool. And quite safe.
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Unread 24-11-2014, 14:42
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Re: One tool/machine to level up a moderate shop

Can anyone who's used an x-y milling vise on a drill press answer my question about edge-finding?
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Unread 24-11-2014, 15:13
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Oblarg View Post
Can anyone who's used an x-y milling vise on a drill press answer my question about edge-finding?
I haven't used one, but why would it be any different than on a mill?
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Unread 24-11-2014, 15:17
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Re: One tool/machine to level up a moderate shop

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I haven't used one, but why would it be any different than on a mill?
A drill chuck isn't nearly as precise as a collet - seems possible to me that it might not gain you much. As we don't have an edge-finder (since we don't have a mill), I'm just looking to know if it'd be a worthwhile purchase if we were to pursue this.
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Unread 24-11-2014, 16:07
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Oblarg View Post
A drill chuck isn't nearly as precise as a collet - seems possible to me that it might not gain you much. As we don't have an edge-finder (since we don't have a mill), I'm just looking to know if it'd be a worthwhile purchase if we were to pursue this.
Any non-garbage drill chuck should have minimal runout. We will use an edgefinger in a drill chuck on our manual mill.
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Unread 24-11-2014, 16:49
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Cory View Post
Any non-garbage drill chuck should have minimal runout. We will use an edgefinger in a drill chuck on our manual mill.
Agreed. Your drill chuck won't be the limiting factor in finding that edge. More likely, you'll lose accuracy from your mill/drill press not being trammed and the actual edge finder itself (only good to within a few thou).

A drill press really isn't as accurate as a mill even if you're just drilling holes and not taking any passes with an endmill. It's just not made to be as accurate.
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Unread 24-11-2014, 17:24
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Re: One tool/machine to level up a moderate shop

Thanks for the replies.
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Unread 26-11-2014, 12:43
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Oblarg View Post
Do you find that putting one of these on a standard drill press holds tight enough tolerances for tube/gusset plate constructions? We've been doing those purely by match-drilling, but being able to drill them independently would be very nice.

Also, if you do have your drill press set up with one of these, do you just use an edge finder in the drill press the same way you would on a mill?
I find that each hole needs to be center-punched, even with an X-Y table, because the bit tends to wander otherwise. Considering that, I don't use an edge finder but line it up by eye.

I suppose one could use a center drill; in this case, I'd still edge it up by eye. Don't expect to hold 0.001" tolerances, and I can judge 0.005 by eye if I'm careful.

Quote:
Originally Posted by asid61 View Post
Drill presses are not designed AT ALL for milling.
Quote:
Originally Posted by Travis Schuh View Post
but I would highly recommend against doing milling.
I thought that was clear in my post, but perhaps not.

Think of cutting a slot 2" long in 1/8" aluminum tubing: Drill holes at the endpoints, cut out the slot, then finish it with a mill in a drill press. Or other light milling. Hogging out metal from a chunk is unlikely to work well, simply because the drill press table will move (I don't care how tight you clamp it).

Spindle bearings are angular roller bearings. Their failure mode is quite predictable and safe: They get noisy. That's why they are used for car wheel axles: Even in a very bad case, the wheel stays on. Wobbles maybe, but stays on (at least until the spindle breaks off).
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Unread 26-11-2014, 13:27
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Re: One tool/machine to level up a moderate shop

When you can get a small manual Sherline or Taig for less than the cost of some industrial drill press it makes no sense to mill with a drill press. These little machines may be made from aluminum but they will cut aluminum all be it slowly. Plus you can basically carry them around all by yourself and they only need a simple conventional wall output for power.

I have a MaxNC10 CNC mill I am cleaning up. Complete with closed loop stepper control. This thing even has an NC tapping attachment (a stepper motor and tap chuck next to the head that it can deploy via aux ports on the control). Even with my modifications I can carry the MaxNC10, the extra attachments and 4th axis around all by myself. I am thinking of building a case so that I can ship it more easily and use mist coolant. I bought it used and fixed it up when they damaged all the leads during the shipping.
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Unread 26-11-2014, 16:18
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Jared View Post
Agreed. Your drill chuck won't be the limiting factor in finding that edge. More likely, you'll lose accuracy from your mill/drill press not being trammed and the actual edge finder itself (only good to within a few thou).

A drill press really isn't as accurate as a mill even if you're just drilling holes and not taking any passes with an endmill. It's just not made to be as accurate.
An edgefinder is better than a few thousandths. The good ones (Starrets are like $10 on ebay) are good to a thousandth or better.
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Unread 26-11-2014, 17:20
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Re: One tool/machine to level up a moderate shop

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Originally Posted by asid61 View Post
An edgefinder is better than a few thousandths. The good ones (Starrets are like $10 on ebay) are good to a thousandth or better.
An edgefinder in a drill chuck on a drill press (which likely isn't trammed as well as a mill would be) is unlikely to do any better than a few thousandths. You'll also need a really smooth x-y table to be able to move the part in small enough increments and react to the edge finder. It may be possible with smooth parts and an edge finder on a mill in a collet in good shape to get accurate to within one thousandth.
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Unread 26-11-2014, 18:10
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Re: One tool/machine to level up a moderate shop

Quote:
Originally Posted by Jared View Post
An edgefinder in a drill chuck on a drill press (which likely isn't trammed as well as a mill would be) is unlikely to do any better than a few thousandths. You'll also need a really smooth x-y table to be able to move the part in small enough increments and react to the edge finder. It may be possible with smooth parts and an edge finder on a mill in a collet in good shape to get accurate to within one thousandth.
That's not the edgefinder itself. That's still the drill press.
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Unread 26-11-2014, 18:24
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Re: One tool/machine to level up a moderate shop

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Originally Posted by asid61 View Post
That's not the edgefinder itself. That's still the drill press.
What I tried to say in the first comment was that the drill chuck wouldnt be the main source of inaccuracy. My few thousandths comment was trying to say that the whole setup on the drill press minus the drill chuck would be within a few thousandths, but I've now realized that the comment isn't clear at all. I think we're in agreement, but my first post wasn't well written.
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Unread 28-11-2014, 23:36
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Re: One tool/machine to level up a moderate shop

Monochron,

One place to find machine tools is manufacturing associations. One I try to point out is the National Tooling and Machining Association (NTMA). Greensboro has a chapter.

Piedmont Chapter
PO Box 13355
Greensboro, NC 27415
Phone 336-312-9197
Fax 336-868-7770
http://www.ntma.org


Edge finders are great for quickly picking up edges but they will only be as accurate in relationship to the run out of the edge finder body. If the body is running out .010 total indicator reading (TIR) do not plan on anything better than .005 in position.

I would like to highly discourage the use of milling on a drill press in a teaching environment. Someone in their own shop in one thing but when students are involved it’s a different story. Starting RPM for a ¼ inch high speed end mill is over 3,000 rpm which is faster than most drill presses will run. With that kind of speed, chatter could break the taper loose on the chuck without any warning.

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Unread 29-11-2014, 10:35
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Re: One tool/machine to level up a moderate shop

One tool I thought I wouldn't need much but I ended up getting for Team 11 was a tapping head.

At some point we had this idea to drill *lots* of holes into aluminum and tap them instead of using rivets.

We have Haas CNC lathe and mill but the rigid tapping feature is over $1,000 after it times out. Not to mention the tap holders and hardened taps.

You can still get tapping heads and at that, tapping heads for CNC machines.
So I grabbed a couple of old Tapmatic NC. We still need to make an interlock plate for the face of the Haas spindle but once we do we can tap in the Haas mill with it and it even works with the 10 tool changer. Then if something happens to the Haas mill we can tap in the manual mills with the same tapping head. If we have no milling machines there's always a drill press with the same tapping head (you put the interlock bar against the post of the drill press). All the interlock does is hold the body of the tapping head from spinning.

So since this tool can easily be gotten for cheap and can be gotten to work on a drill press. If someone envisioned lots of tapping (say for tool plates or Erector set parts or something like that) it might be handy to have around.

No idea what a tapping head is, watch this:
https://www.youtube.com/watch?v=gtYzhlKFbjA

Last edited by techhelpbb : 29-11-2014 at 10:38.
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