Wolfie | 13/05/2014 22:18:11 |
![]() 502 forum posts | Think I've asked this before, but how the hell do I drill a square hole? |
jason udall | 13/05/2014 22:21:40 |
2032 forum posts 41 photos | There are drill systems to do this..but... How deep? Blind? How big? If not blind..drill corners..drill center then broach... Or rota broach |
John Stevenson | 13/05/2014 22:23:22 |
![]() 5068 forum posts 3 photos | Do a Google / You tube for square hole drills, loads on there but if possible have a look to see if you can use something with a square in it already like a socket and adapt that. Not always possible I know.
Can also be done with a rotary broach, some articles in MEW on that also You tube video's.
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jason udall | 13/05/2014 22:23:59 |
2032 forum posts 41 photos | Rota broach is how ( well one way) that hex holes etc can be put in the end of bolts...forging is also used but... |
magpie | 13/05/2014 22:25:25 |
![]() 508 forum posts 98 photos | That must have been a VERY loooooong drive you have been on Cheers Derek. |
Andrew Johnston | 13/05/2014 22:28:47 |
![]() 7061 forum posts 719 photos | Use a square drill! No, seriously, you can drill a square hole, or any other regular polygon. You actually use a triangular drill and a square guide plate with a special chuck that allows the drill to float. See this link: Mind you they're pretty expensive, so the more common method is to drill a round hole and broach, slot or file it square. Andrew |
NJH | 13/05/2014 22:29:05 |
![]() 2314 forum posts 139 photos | Wolfie HERE is the principle. --- however, although there are chucks/bits to do this it's unlikely that it will be economical to do at home.Drilling a round hole and using a broach of some sort is possible. HERE is another idea . Norman |
Michael Cox 1 | 13/05/2014 22:36:16 |
555 forum posts 27 photos | Hi Wolfie, Rotary broaching is the best way for short holes and the equipment is not so difficult to make see:http://mikesworkshop.weebly.com/rotary-broaching.html Mike
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JasonB | 13/05/2014 22:54:33 |
![]() 25215 forum posts 3105 photos 1 articles | here is where you asked it before, same old answers, also several other threads if you search
Edited By JasonB on 14/05/2014 07:19:28 |
Wolfie | 13/05/2014 23:14:26 |
![]() 502 forum posts | |
John Olsen | 14/05/2014 04:20:22 |
1294 forum posts 108 photos 1 articles | Unless you are going to make a habit of needing square holes, the way to do it is to drill a round hole and then file out the corners. A round hole already has 80% of the material removed. (OK, 78.54.....) Of course, this is not so convenient if it is not a through hole but even for that you can drill a round hole, make up and harden a kind of square punch, and drive it in to take out the corners. This will not make it square all the way down but it will not usually matter if there is a bit at the bottom that is not square. For that matter, the square drilling approach does not actually give a true square, the corners will be rounded. A broach will give a true square hole, but again only on a through hole. Unless you are getting into mass production, the answer to most things that can't be machined with the machines you have is going to be a hacksaw, a file or two, and a scraper. Maybe a few good cold chisels too. And some patience John |
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