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HELP Wanted! Cutting Metal - But By What Means?

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Ian S C04/12/2009 11:03:25
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7468 forum posts
230 photos
It's possible to build a power hacksaw from vertually scrap metal and a 1/4hp motor,and a bit of imagination,I did and used 12" industrial grade blades,but you could make it to use ordenary hacksaw blades.I dismanteled my one after I bought a 4 1/2" h&v bandsaw,wish I'd kept it.IAN S C
Gordon W05/12/2009 10:09:31
2011 forum posts
IanSC thanks, I have thought about building a power hacksaw, the only ones I've seen or used are big industrial ones, can't get my head round making the slidey bits in small scale without milling gear etc.. Have tried the web, only one I could find looked very "messy", and not very easy to make work. Any sources? I'm not bothered about looks really.
Ian S C05/12/2009 11:05:02
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7468 forum posts
230 photos
Gordon neither did I now how to get round the problem of the"slidy"bits so I didn't,instead I made two connecting rods about 6" long and suspended the frame with these from a 2"x1/2" bar that was pivoted at the rear of the machine,and the frame was attached to a crank with a 3" through,the bed was a piece of 5"x2" channel.With the cranks the bar over the top rose up and down as the saw reciprocated.Ball races in each end of the con rods,and in the rotating parts.IAN S C
JasonB05/12/2009 11:29:08
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25215 forum posts
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There are details of Westbury's one on this very site
 
Jason
Ian S C06/12/2009 09:58:58
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7468 forum posts
230 photos
Hi jason had a look at Westbury's saw,I'd have 2 complaints about it (1)short blade.(2) castings.The design could be adapted for fabricated assembly,and in that case the frame could be made any size you like.Just as an aside,I'v got a little power hacksaw with a junior hacksaw blade that I run on one of my hot air engines,It does take 15-20 min to cut a 10mm steel bar.Ian S C
Circlip06/12/2009 12:27:39
1723 forum posts
But the beauty of a power Hacksaw is that you don't NEED to stand and watch it.
 
  Regards  Ian.
Gordon W07/12/2009 09:58:29
2011 forum posts
IanSC, thanks for that, think I understand you, will get the little drg. board out soon,seems doable with my equipment, am I right in thinking the main criteria is to get both conrods the same centers?
Ian S C07/12/2009 10:22:28
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7468 forum posts
230 photos
Hi Gordon The con rods Are vertical and pivoted at the corners of the frame,so about 300mm apart,they could have been 4" long.The frame was 5-6" deep and as I had some was made of 1 1/4" square steel.Never having used an electric welder I went out and bought one and used the saw as a do it yourself learning process,all welds hung together!You could make the frame from any number of steel sections.if lighter you just add more weight.ou can make legs or sit it on a box or bench,legs make it so you can hang the motor underneath.Ian S C
Gordon W08/12/2009 14:49:20
2011 forum posts
Iansc, thanks for that, just to get my head clear,(just back from dentist) The hacksaw frame hangs on two "con rods" which are hanging from a horizontal bar. The h/saw frame is driven from a conrod/crankpin? Is it just gravity that keeps it cutting vertically? It all sounds to easy. As I am now skint, see above, might be next job.
Ian S C09/12/2009 11:04:16
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7468 forum posts
230 photos
Yep you got it Gordon,I was,still am skint also,so my saw cost only time and $NZ10 for an industrial hacksaw blade,about the same as a blade for one of the small H/V bandsaws.Yes the frame is driven by a conrod.The bearings used were heavy duty with 1/2" bore,there was very little side play.Ian s c
Gordon W09/12/2009 11:48:33
2011 forum posts
Thanks for all that Iansc, more or less "designed" one while at dentist, clears mind. Will use std. blades since had a box full given, also two hanging rods each side of horizontal bar, should be stiffer, thanks again.
Ian S C10/12/2009 11:02:31
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7468 forum posts
230 photos
Sounds like its the dentist whos keeping you skint!Ian S C
Ian S C10/12/2009 11:09:19
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7468 forum posts
230 photos
Sound as tho the dentist is the one keeping you skint,or is dental work on the national health?Ian S C
Gordon W10/12/2009 15:33:23
2011 forum posts
Right first time, but I am old enough to remember when it was on NH. Latest quote is more than a small eastern lathe.
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