Square holes

This topic has 17 replies, 10 voices, and was last updated 16 October 2011 at 08:31 by Clive Hartland.

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14 September 2011 at 11:01 #74920
Gary Brooke
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@garybrooke63895
Hi all just got back from holiday. Time to get on with our loco.the question is how do you make a 5/16 square hole in3/8 plate about 1 1/2 deep with out coming through the side thanks .
Regards Gary .
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14 September 2011 at 11:01 #5659
Gary Brooke
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@garybrooke63895
14 September 2011 at 11:40 #74922
Andy from Workshopshed
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@andyfromworkshopshed
Gary, you’ve not said what material you want to make a hole in. There are some clever tools that allow you to “drill” square holes but this is quite small and I don’t think those would work.

Perhaps a small cold chizel is the solution?
14 September 2011 at 12:14 #74924
Gary Brooke
Participant
@garybrooke63895
Thanks for the prompt reply. The material is BMS. But would a small chisel distort the outer surface as I reckon there will only be op 1/32 left each side

Regards Gary
14 September 2011 at 12:26 #74925
Andy from Workshopshed
Participant
@andyfromworkshopshed
Yes, that’s quite possible.

The only other idea I can give you is to drill all the way through, use a broach to square off the hole and then plug the back of the hole. Looking at the MEW index #26 has an article on broaching

Here’s an example of a chap whole made a 1/8th blind hole that way.

http://www.chaski.com/homemachinist/viewtopic.php?f=8&t=82230&start=135
14 September 2011 at 12:30 #74926
Andy from Workshopshed
Participant
@andyfromworkshopshed
That article in #26 looks good and has some advice on making broaches too. There’s another article in MEW #135 too which has advice on making them
14 September 2011 at 12:35 #74927
Keith Long
Participant
@keithlong89920
Gary, could you attack this another way, by making a sandwich of 5/16 for the filling with the space left in it for the hole you’re after and 2 side cheeks of 1/32. Join the whole lot together by silver solder or rivets?

Just a thought – never built a loco and probably never will!

Keith
14 September 2011 at 13:17 #74928
Ian S C
Participant
@iansc
Another way, use a piece11/32″ thickand machine a slot 5/16″square,then silver solder, or other wise attach a 1/32″ plate. isc
14 September 2011 at 13:18 #74929
Ian S C
Participant
@iansc
Another way, use a piece11/32″ thickand machine a slot 5/16″square,then silver solder, or other wise attach a 1/32″ plate. Ian S C
14 September 2011 at 17:32 #74933
Niloch
Participant
@niloch
From ME 3705 – 20 to 31 May 1983:

A New Method of Slotting Square and Rectangular Holes by Arnold Throp

His introductory paragraph reads:

When I wrote the article on my new slotting attachment which appeared in ME 3598/3599 I described one method of slotting holes, using a D-shaped cutter, and indexing from the jaws of the four jaw chuck. Since then I have produced many square holes this way, including some only 1/8″ square in the valve operating levers of my Corliss engine model. Such tasks are easy but as the size of the hole increases the tool is more prone to elastic deflection and “push-off” when cutting across a wide face.

However, I have been able to devise a new method I have not seen elsewhere, which overcomes this trouble………………..
15 September 2011 at 17:47 #74961
mick
Participant
@mick65121
Hi. All.

Perhaps we’re looking at this problem from the wrong direction. The amount of heat required to silver solder the fabrication would certainly be enought to make it bend like a banana.

I think it would be nigh on impossible to cut a 5/16th square cleanly through an inch and a half of 3/8th squ. MS even if you could hold it you would need an industrial broach and these are quite long, you would also need a decent size fly press.

The only way I can see is to get an industrial workshop to cut the squ in a larger section, at least 5/8th. Then produce a 5/16th squ packing piece that is a decent push fit to the broached squ. then mill the service stock away to produce the 3/8 squ. then remove the packing, but I would think even this approach would distort the section.

I can’t imagine what this is for, but its an awful lot of trouble to achive.
15 September 2011 at 18:02 #74962
Andy from Workshopshed
Participant
@andyfromworkshopshed
Some out of the ball park ideas….

Drill a large round hole and pack the sides with 4 pieces cut from a round bar to leave a square hole in the middle.

or use an electrical discharge machine
15 September 2011 at 21:00 #74966
Versaboss
Participant
@versaboss
>>Time to get on with our loco.the question is how do you make a 5/16 square hole in 3/8 plate about 1 1/2 deep with out coming through the side thanks . <<

As a non-locomotive builder it would interest me which part of a loco needs a deep square hole in the side of a 3/8″ plate. What’s the purpose on the original, and how did ‘they’ make it? (supposing the scale relationship is the same).

Greetings, Hansrudolf

(**cking editor: when I use the quote mechanism I cannot return to normal mode!!!

Edited By Versaboss on 15/09/2011 21:03:19
16 September 2011 at 11:12 #75002
Gary Brooke
Participant
@garybrooke63895
Hi Versaboss.
The hole is in the link bracket that I am fabricating. Not quite sure what it’s for time will tell. I assume that in full size it would be a casting.
Regards Gary
15 October 2011 at 21:56 #76343
Clive Hartland
Participant
@clivehartland94829
I have a Japanese video of a square hole drill, I dont know how to put it on the forum.

I can send it to someone as an email who can then post it if possible.

Its quite an amazing bit of kit and is shown in slow motion.

Clive
16 October 2011 at 06:21 #76363
ady
Participant
@ady
Probbly this one?

http://www.youtube.com/watch?v=ALiqAXiTQBg
16 October 2011 at 08:21 #76366
Kerrin Galvin
Participant
@kerringalvin72662
Hi Gary,

“Hi all just got back from holiday. Time to get on with our loco.the question is how do you make a 5/16 square hole in3/8 plate about 1 1/2 deep with out coming through the side thanks .
Regards Gary .”

A little confused if the plate is 3/8 thick, then a 1 1/2 deep hole is going to stick out the back a bit! I’m guessing that you are putting it into the 3/8 thickness? As a suggestion, find a water cutter company close to you & go see what they can do for you, the hole will come out the back but you can easily plug that.
Cheers Kerrin
16 October 2011 at 08:31 #76367
Clive Hartland
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@clivehartland94829
Yes, thats the one so no need to email to anyone!

Clive
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