The Breakroom > The Water Cooler
Another Fruitful Day in The Hills
John Hill:
Thanks Darren but if I need to do any heavy cutting I will turn to this old stalwart...
Darren:
Well that's different John,
I think we deserve an explanation...... :thumbup:
bogstandard:
--- Quote ---Hacksaw's, be they manual or mechanical always cut on the backstroke,
--- End quote ---
That was a standard apprentice gotcha, put the blade in the wrong way around, they would spend ages trying to cut thru a bit of bar.
As far as I know, a hand hacksaw cuts on the forwards stroke, only the Japanese wood saws cut on the backwards, and CC of course.
Bogs
John Hill:
--- Quote from: Darren on August 06, 2009, 04:46:23 AM ---Well that's different John,
I think we deserve an explanation...... :thumbup:
--- End quote ---
It is a 2HP chop saw with a HSS blade of about 10" diameter, 32 tpi (I think). It is very heavily geared down in fact the blade is maybe too slow turning at only about 50RPM.
I got given it because it had a 3 phase motor and a broken blade but I knew where there was a blade that only needed sharpening and the single phase motor on it now came from an industrial size floor polisher.
It cuts much faster than a power hacksaw and makes a perfect finish exactly square, or at an angle if the vise is set over.
sbwhart:
--- Quote from: John Hill on August 05, 2009, 06:08:41 PM ---OK, I am going the change the blade around in mine as I find hacksawing very frustrating due to wandering off line, perhaps pulling to cut will be better. :scratch:
--- End quote ---
Hi John
I have set the blades so they cut going forward, just the way I was taught, learnt to haxsaw when an apprentice, part of the kit of tools we made in the first year training shop was a set of three leveling jacks there were made from old 3" dia line shafting, if you were caught messing about the punishment was cutting jack blanks out of the shafting, boys being boys we soon turned the punishment into a competition: how quick, least number of blades etc, we soon learnt to haxsaw.
:D
Any way this is my recipe:-
Get the tension in the blade correct not too much not too little:-
Don't force it let the blade do the work:-
Put a little bit of oil or WD40 on the blade:-
Use good quality High Speed Steel Blades Cost a bit but they out last cheepies 10 to 1:-
Use the correct blade for the job you can get them with different teath per inch the thinner the part the more teath per inch you need:-
And to help keep the cut straight use the vice jaws as a guide or for bigger bits clamp a bit of tool steel up against the job.
Using jaw as guide blade set at 90 deg in frame
Or this way
This is the result only a little bit left to mill away
This is my collection of saw
The ally saw has the blade set at 90 deg, the yellow blade has 24 TPi used for thin plate The small job is a junior my Dad made about 50 years ago, its made in one pice bent round to shape:-
I love old home made tools I think they say so much about the maker.
I hope you keep your hands clear of that circular chop saw it looks a nasty beast an accident waiting to happen
Have fun
Stew
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