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Blackgates power hacksaw drawings

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Steve Wan22/12/2011 17:14:31
131 forum posts
3 photos
Hi Guys
 
Was wondering anyone out there be so kind to scan the Blackgates Power Hacksaw drawings? Need to look at the pulley & belt design and consider worth ordering from Blackgates or make one as I'm far from the UK.
 
May also check with Hemingway but not sure is the design similar to Blackgates which is compact.
 
I'm keen on a compact power hacksaw using normal blades. My biggest steel rod to cut is around 30mm. Hence I hope to build a very small and yet powerful enough to part off steel bar. Most importantly, minimum overhang to cut down the noise as I stay in a flat.
 
Am very grateful anyone would aid me here
 
Steve Wan
Clive Foster22/12/2011 21:52:56
3630 forum posts
128 photos
Steve
 
If you have a source of decent hex steel bar it's well worth considering copying the Kennedy saw guide bar arrangements. Not too difficult to make, easily adjusted and very effective. Had one in the lab support workshop at my old employers which saw much use. Overall design lends itself to home shop simplification with a flat base plate, commercial work vice and simple plummer block bearings on posts. Simple flat pulleys too. A multigroove belt would work just fine.
 
Clive
Mark Foster 122/12/2011 23:12:56
34 forum posts
take a look at Myford Boys power hacksaw on u tube its great . drawings are ok an easy build
Steve Wan23/12/2011 06:42:09
131 forum posts
3 photos
Hi Clive & Mark
 
Thanks for the reply! Anyway to send me the link and pdf drawings? I'm open to any simple compact straight forward power hacksaw design.
 
I have an AC 1/3 Hp motor on the stand by and 2 step pulleys...the rest may need to make or hunt for especially the huge flywheel that crank the saw motion...most parts will be in mild steel plates and aluminium blocks.
 
Hopefully, I can construct a compact power hacksaw and could be taken apart for easy stroring. I have been sawing manually, is about time to move ahead as no more younger
 
Steve
Ady124/12/2011 12:45:15
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6137 forum posts
893 photos
I made a simple chopper upper out of a standard hacksaw which can be used with my backgear.
 
The Piccies are in my album.
 
Handy for chopping up big long bits, I keep my hand on the top of the hacksaw to stabilise it.
 
The 3jaw opens out to tighten on the hole in the "flywheel"
 
The bar has a couple of bearings and orange polyprop shims to adjust for a straighter cut.
 
Heath robinson stuff but it's chopped a load of 45mm rebar into manageable lengths with a single hacksaw blade.

Edited By Ady1 on 24/12/2011 12:52:44

Stub Mandrel24/12/2011 15:12:24
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4318 forum posts
291 photos
1 articles
Great coarse engineering Ady!
 
Neil
Brian Dickinson24/12/2011 17:22:59
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62 forum posts
13 photos
OMG is that safe?
Jeff Dayman24/12/2011 18:36:58
2356 forum posts
47 photos
Probably one of the most UNSAFE lashups I've ever seen on a power tool. So much could go horribly wrong here I can't begin to comment.
For your safety and the safety of your lathe bed please do not set up a hacksaw and lathe this way!
 
Ady must have been well on the grog when he came up with that one!
 
Almost as bad as the time a neigbour of mine wanted to split some firewood. He jacked up the rear end of his pickup truck and removed a rear wheel. He then took a spare wheel without a tire on it and welded an axe head to it, so the wheel would spin the axe around against the wood placed (by hand) under it, ahead of the rear wheel. He rigged this up, started the truck and placed it in first gear to spin the rear wheels, with a piece of wood on the gas pedal to run engine at a fast idle. He successfuly split one piece of wood, without amputating any part of himself, by some miracle. Next piece of wood had a knot. Axe hit knot, truck was lifted off jackstands, dropped to the ground and took off down the field until it hit a tree, sans driver. Thank heavens he didn't rig it to run in reverse and sat behind the wheel, or he would have been run over. He sure was surprised when that truck rose up and took off.
 
Merry Christmas to all
 
JD
Springbok24/12/2011 18:51:56
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879 forum posts
34 photos
 
Ady1
 
I think as head of technology I would have been sacked and sued for that setup
I have seen some wacky ideas on american blogs but yours wins,
Steve I know you have only a little flat but a small vertical bandsaw would suit where you live I am sure there are many supliers,
Kindest regards and a prosperouse new year
 
Bob
Ady125/12/2011 01:12:21
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6137 forum posts
893 photos
Thank you Mr Stub.
 
Tsk tsk tsk.
I suppose Frank Whittle had the same problems, genius and simplicity ridiculed by unbelievers...
 
Here's five feet of 45mm rebar (which is tough stuff) and a knobbly bit which I cut off tonight.
 
 
The blade had no broken teeth at the end of its work, the back gear works at about 50 beats a minute so the downside is it's no faster than a human, it just never tires out.
This job took about 3 hours.
 
The sneaky bit is the blade...it's the wrong way round...the handle end was the only bit with enough metal to set up a fast simple mechanism.
 
 
So the blade is actually being PULLED through the workpiece, and the far end is now the handle, which you use just like a normal hacksaw, except now the machine is doing all the sweaty work.
 
You simply push down on the cutting stroke as the machine works, you soon get into the rhythm.
 
At the end of the cut you stop the machine as the cut opens.
 
simples.
Dunc25/12/2011 02:57:15
139 forum posts
Couple of plans here
http://books.google.com/books?id=RdMDAAAAMBAJ and go to the Feb 1976 issue
 
http://books.google.com/books?id=iigDAAAAMBAJ&source=gbs_summary_r&cad=0_0#all_issues_anchor and go to the Feb 1964 issue
Gordon W25/12/2011 10:19:45
2011 forum posts
Well I like it Ady. I've been thinking about a similar idea for some time, but with the stock in the chuck. All you have to do is remember to hang on to one end, and keep kiddies well away. But I would use the 9" angle grinder for your job.
Ady125/12/2011 11:37:04
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6137 forum posts
893 photos
But I would use the 9" angle grinder for your job.
 
And it would take 5 minutes tops with a decent cutting disc setup.
ding ding ding ding ding...job sorted
The problemo is these things cant be done if you're in a flat at 9pm after being at work all day and you want to stay on good terms with your neighbours.

Gawd knows what my neighbours would think if they knew, the local council clergy are another problem too.
Ady125/12/2011 12:18:17
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6137 forum posts
893 photos
That Kennedy Hacksaw looks like a pretty cool wee machine
 
The use of hex bar is very clever, you can see it in action in the utube clip
 
 

Edited By Ady1 on 25/12/2011 12:24:25

Steve Wan25/12/2011 16:32:53
131 forum posts
3 photos
Hi all and Bob
 
Thanks for the tips and I like Ady's quick fix for power hacksaw
After some serious thinking...I have to lay off the idea of the Blackgates power hacksaw castings or Kennedy power hacksaw project...seems many parts are not available in my country and the noise of sawing is obvious.
 
Would carry on the old fashion of sawing which I can control the noise level, middle of the night I use a fretsaw instead...though a longer time is needed but I do get the job done in the end.
 
With the bi-metal saw blades in the market, sawing is less taxing now.
 
Steve Wan
 
 
Bazyle25/12/2011 17:42:55
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6956 forum posts
229 photos
Neat idea Ady. I think I might make one using an alternative nut to the tension wingnut from square with a ballbearing in it then I still have a proper handle.
 
I recall there is a lathe powered design which has a support frame pivoted on a bearing on a morse taper to go in the headstock. Then a crank goes on the protruding end of the shaft and the link rod goes rearward to an extension of the blade frame to keep it all compact.
Francis Sykes25/12/2011 20:33:48
43 forum posts
5 photos
I like the old Drummond Ady, I've got to sort out the wiring and a toolpost for mine before I get it going.
 
Ingenious set up, it'd never meet today's h&s standards, but then nor would most of our machines. Still a load safer than a hand held grinder.
Ady125/12/2011 21:22:34
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6137 forum posts
893 photos
I like the old Drummond Ady, I've got to sort out the wiring and a toolpost for mine before I get it going.

You are a lucky man
You have one of the best 3.5 inch lathes ever made.
Cyril Bonnett25/12/2011 22:40:29
250 forum posts
1 photos
Plenty of homemade hacksaws in Popular mechanics some dating back to 1909

Google books

Edited By Cyril Bonnett on 25/12/2011 22:46:28

Edited By David Clark 1 on 26/12/2011 00:08:21

Cyril Bonnett25/12/2011 22:43:40
250 forum posts
1 photos
I guess the problem with long web address hasn't been resolved, I've changed it so that it doesn't mess up the web page.
Cyril

Edited By Cyril Bonnett on 25/12/2011 22:47:54

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