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17th July 2015, 10:53 AM #1Intermediate Member
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Bought a power hacksaw - requires a motor
I picked up a Peerless power hacksaw the other day. It is without a motor.
What horsepower motor is required? I wouldn't have thought more than 1/2 or 3/4 HP would be required.
The motor (with unknown pulley size) drives a 7" pulley. This is coupled to a 2" pulley driving an 8" pulley. If my understanding of pulley arrangements is correct, then a 1400 RPM motor fitted with a 2" pulley should result in a final speed of 100 RPM, or 50 cutting strokes per minute:
( 1400 RPM x 2" x 2" ) / (7" x 8") = 100.
Does this sound correct?
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17th July 2015 10:53 AM # ADSGoogle Adsense Advertisement
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17th July 2015, 11:01 AM #2.
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100 sounds right.
1/2HP is plenty.
The small power hacksaw we have at the mens shed is only 1/3 HP and it has no trouble cutting stuff.
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17th July 2015, 01:55 PM #3
Andrew you could always run it off steam or peddle power
I have a small ALDI old belt sander motor here if your interested I'll check I am sure it 1/4 hp 3000 rpm maybe less.
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17th July 2015, 02:14 PM #4
I have a similar saw that looks to be based on the same design.
IMG_0064.jpg
3/4 HP with 2" motor pulley.
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17th July 2015, 02:42 PM #5Intermediate Member
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17th July 2015, 02:44 PM #6Intermediate Member
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17th July 2015, 03:48 PM #7
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17th July 2015, 06:17 PM #8Philomath in training
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I have a 1420rpm single phase (4P) motor, 3/4 HP from an old drill press if that is any help.
Michael
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17th July 2015, 07:42 PM #9
Peerless
I have the same saw , I have used it a quite a lot , I think they were made in Ballarat . Mine is mounted on lengths of railway track which makes it very stable , they tend to jump around if they are not mounted on something heavy . Mine is a tad too fast , I think 70 to 80 would be better rather than 100 strokes per minute . I replaced the shafts and made some bushes as it was a very worn out machine when I got it . I think mine is a 1/2hp motor . Mike
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17th July 2015, 11:03 PM #10GOLD MEMBER
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If I remember correctly, a washing machine motor works well on them, and they're dirt cheap too.
Kryn
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18th July 2015, 08:48 AM #11Intermediate Member
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Thanks for that. I think a 1.5" pulley would drop the speed to ~75 strokes. Thanks also for letting me know about the jumping about. I was planning to put it on casters, but I won't now. I'll just have to deadlift it when I want to use it
Are you able to tell me whether the motor rotates clockwise or anticlockwise if you are facing the motor from the spindle side?
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18th July 2015, 09:02 AM #12Intermediate Member
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18th July 2015, 10:30 AM #13.
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At the mens shed we have ours on lockable wheels and it is a hoot watching it slowly wobble its way across the floor when a member forgets to lock the wheels. Every time i see it do this it reminds me of a minimalist 70's dancer, you know the ones that stand in one place and just jiggle about a bit. I should rake a movie of it and add some appropriate music.
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18th July 2015, 10:30 AM #14Philomath in training
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18th July 2015, 10:37 AM #15
Rotation wouldn't matter surely just remember to put the blade in the right way round.
What about an old spin dryer motor. No don't have one.
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