Power HACKSAW question

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AllenH59
Posts: 387
Joined: Wed Mar 16, 2011 1:26 pm
Location: Prince George BC Canada

Re: Power HACKSAW question

Post by AllenH59 » Sun Feb 02, 2020 8:33 pm

I went down town one day to buy a Right Hand brazed carbide lathe tool, and a 7x12" King bandsaw followed me home. The tool was about $7.. The saw was about $1100. Aside from complaints of some low blade quality, it is a great saw. When fabricating it is nice to make pieces fit.

wally318
Posts: 116
Joined: Sun Jun 05, 2011 1:06 am
Location: Kelowna, British Columbia

Re: Power HACKSAW question

Post by wally318 » Wed Feb 05, 2020 1:13 am

Well the saw arrived a couple weeks ago.
So here's some pics: ...
the motor wouldn't start up, but I knew that.
Turned out to be a wire not connected at the motor.
Rewired the motor and switch and motor kicked in just fine.
The motor is a Canadian made Tamper with factory Shima
paint on it. It seems the motor was shipped from Canada,mounted
and painted and then shipped here.
I'll mount the motor back on this weekend and give it a test run.
With the motor off the mechnics seem to work fine. Turn the
large pulley-the blade moves-the cam lifts.
My only concern is the down feed shaft/cylinder.
I don't really understand how it works. There doesn't seem to be any adjustment.
Any of you ever see a set up similar to this?
Any input would be most appreciated.
Attachments
saw 1.JPG
saw 2.JPG
saw 4.JPG

armscor 1
Posts: 130
Joined: Sun Jun 12, 2016 3:12 am

Re: Power HACKSAW question

Post by armscor 1 » Wed Feb 05, 2020 1:25 am

The down feed is purely the weight of the frame, gravity does the job, that is how it is on mine.
Many years ago I used a power hacksaw that had a sliding counter weight, slide out and more aggressive feed.
Hope that helps.

wally318
Posts: 116
Joined: Sun Jun 05, 2011 1:06 am
Location: Kelowna, British Columbia

Re: Power HACKSAW question

Post by wally318 » Wed Feb 05, 2020 2:55 am

That seems like common sense to me, but ...
I still don't understand what that cylinder/shaft does.
Does it just stabilize the blade assembly as it comes down?

armscor 1
Posts: 130
Joined: Sun Jun 12, 2016 3:12 am

Re: Power HACKSAW question

Post by armscor 1 » Wed Feb 05, 2020 5:07 am

Hi wally, my power hacksaw has 2 pistons submerged in a oil bath and connected to the underside of the pistons.
The lift piston has a fine adjustable bleed valve.
The piston driven off the cam is double the diameter of the lift piston. When it is on the return stroke the cam is timed to drive the larger piston down and in so doing moves the lift piston up and lifting the blade off the work. On the forward cutting stroke the oil bleeds out of the lift piston and the blade engages the work.
I adjust the bleed valve so it is a smooth drop and not delayed.
Hope this helps.

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