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Swarf&Sparks
06-16-2005, 11:45 AM
ok, I can drill triangular holes, but.....
http://upper.us.edu/faculty/smith/reuleaux.htm

Paul Alciatore
06-16-2005, 11:51 AM
I think we discussed this before. Do a search of the past topics.

Paul A.

BillH
06-16-2005, 12:00 PM
Reminds me of a rotary engine.

J Tiers
06-16-2005, 12:09 PM
Looks like this. Drill and guide. Holder not shown.

http://img.photobucket.com/albums/0803/jstanley/watts1s.jpg

[This message has been edited by J Tiers (edited 06-16-2005).]

Wirecutter
06-16-2005, 01:25 PM
<font face="Verdana, Arial" size="2">Originally posted by J Tiers:
Looks like this. Drill and guide. Holder not shown.</font>

After the previous topic, I called Watts tool and got a catalog. They make thingys that do triangular, square, and hex holes.

The stuff isn't cheap - seems to me it was around $300 to drill your first square hole. I'm still trying to understand how it works, though. The link that Swarf posted leans in the right direction, I think. In any event, that's what J Teirs is showing - the Watts solution.

So, J Teirs - that looks like a half-inch size. You making your own socket set? http://bbs.homeshopmachinist.net//wink.gif

-M



[This message has been edited by Wirecutter (edited 06-16-2005).]

thistle
06-16-2005, 03:18 PM
Either the drill bit is articulated and the work is fixed to the hard square guide and machine table
(so the bit can get in the corners)
Or the other way is with a straight non articulated drill,the hard square guide is fixed to the work,but the work and guide are able to wobble back on forth on some thing like drill rod on top of the machine table.

You wont get a perfect square as there is some material left in the corners that needs cut out with a file.

Looks like the type of thing that would win lots of bets.

darryl
06-16-2005, 06:39 PM
If you can drill a three sided hole with a two fluted drill bit, then why can't you drill a four sided hole with a three fluted bit? http://bbs.homeshopmachinist.net//smile.gif Or how about a four sided hole with a two fluted bit, but the flutes are only 90 degrees apart- http://bbs.homeshopmachinist.net//smile.gif
Hey, at least with that one you'd be sure to not get a round hole. http://bbs.homeshopmachinist.net//smile.gif

webbch
06-16-2005, 09:26 PM
I've never understood how a rotary broach operates (and have never seen one close up) -- Is it based on this principle? Or is it a completely different ball of wax?

Chad

J Tiers
06-16-2005, 11:03 PM
No, actually, I don't use it. But it was going begging at a sale, buried in the junk. So I bought it.

I got the holder, a couple of the guides and drills.

The guide gives some structure to it. I need to call Watts and get the "how to use it" info.

But I have been told that one drills a round hole first. The "drill" really only cuts on its end, and not that well, so a starter hole gets it going.

Past that unreliable info, I know nothing. But I could use a 1/4 and 5/16 drill also if I were going to use it. All I have are 1/2.

BTW, the holder is like a floating reamer holder. It allows the drill to move around while held parallel.

chief
06-17-2005, 02:31 AM
I have used these before ,You drill a round hole, setup the floating head and correct guide in the drill press and the bit basically bounces back and forth in the guide hogging out a square hole.

canman
06-17-2005, 02:51 AM
A Square broach. maybe

Wirecutter
06-17-2005, 01:15 PM
<font face="Verdana, Arial" size="2">Originally posted by J Tiers:
No, actually, I don't use it. But it was going begging at a sale, buried in the junk. So I bought it.</font>

Damn. Wish I'd been there.


<font face="Verdana, Arial" size="2">
The guide gives some structure to it. I need to call Watts and get the "how to use it" info.
</font>

Well, Watts doesn't have a web site - I checked. When I called, it sounded like I must have been talking to a guy named Watts, who had just stepped away from a running machine to answer the phone. I don't know if that's true, but it sounded like that over the phone. Anyway, I gave him my info and he mailed me a catalog, price list, and a kind of selection guide. Total of about 20 photocopied pages.

The selection guide may be what you need. It explains how the process works and what all you need to buy to drill your first square (or triangular or hex) hole. You have to have the floating chuck thingy and the correct guide along with the special drill bit, which it sounds like you do. I can almost understand how to use the stuff from reading, but it would really come together if I had everything in my hand. Seeing is believing, you know?

So, you wanna unload your stuff? I'll pay the shipping.

-Mark

J Tiers
06-17-2005, 10:45 PM
Nope, I may add some bits of sizes I would use, though. I just haven't got a round-tuit on the deal.

I believe I have 27 projects, then if I walk upstairs out of the shop, there are at least 18 more.