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6th October 2013, 07:20 PM #1Mechanical Butcher
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Power hacksaw - cutting direction?
I just got an old King Rex hacksaw, made in Taiwan. Something about it is puzzling.
When I'm standing in front of it near the vice handle, the hydraulics lift the cutting frame when it's moving away from me.
That means its cutting stroke is when it's moving towards the vice's moving jaw rather than the fixed one. That seems odd.
I think I can arrange for it to lift the other way by relocating the cam that operates the hydraulics.
I wonder if the motor is turning the wrong direction?
Anybody have a power hacksaw that can let me know how theirs works?
Jordan
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6th October 2013 07:20 PM # ADSGoogle Adsense Advertisement
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6th October 2013, 07:40 PM #2Distracted Member
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- May 2010
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- Lower Lakes SA
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Mine is like yours. Some are the opposite. As long as you put the blade the right way it will work fine.
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6th October 2013, 09:07 PM #3
As Bryan said , I preffer the cutting action to be as the blade moves back towards the motor, I have found there is less chatter this way.
Ashore
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6th October 2013, 09:14 PM #4Senior Member
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- Feb 2013
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- Laidley, SE Qld
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The King Rex power hacksaw cuts on the forward stroke. That had me confused for a while because everyone knows that power hacksaws always cut on the back stroke. They were sold as King Rex and quite a few different brands as well.
I was setting up at Toowoomba swap meet (1000 odd sites) 4 or 5 years ago when the guy on the very next site arrived with this well used version on his ute. Talk about a sign from Above.
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6th October 2013, 09:26 PM #5Mechanical Butcher
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That looks like mine.
Thanks for the confirmation that it's working as designed, folks.
If it gives problems with chatter, I might try altering it to cut the other way.
Jordan
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7th October 2013, 12:19 AM #6Senior Member
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- Laidley, SE Qld
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When I was first got mine the blade lifter wasn't working, so from that point of view it made no difference which way round the blade was fitted, but the saw still cut much better when cutting on the forward stroke.
I reasoned that it was all to do with the geometry of the main drive wheel (which rotates CCW when viewed in the photo) and the link to the sliding frame. That said, the cast iron base is quite solid, the fixed jaw of the vice is quite solid as are the moving jaw and screw, I doubt that you are going to have any serious chatter problems.
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7th October 2013, 09:46 AM #7Mechanical Butcher
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- Oct 2004
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- 920
There's a similar Great Captain hacksaw, Japan made, shown on YouTube: Great Captain power hacksaw - YouTube (and a couple of others, all the same machine apparently).
The crank wheel rotates the opposite way from the King Rex, and cuts on the back stroke. That's not to say it hasn't been changed from standard though.
There isn't much offset in the crank geometry, and not much difference in forward and backward stroke speed. It could be the offset is to get some DeSaxe effect to avoid slapping.
Jordan
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