I've got an improvement to the 'take your time' tip... interleave (posh word huh?!) the sawing with some other operation. I had to make an accurate 3" long cut through a lump of steel so I did it in bursts of a minute at a time as and when between some turning work. Took all afternoon but I hardly noticed it - the arm didn't ache and the cut was pretty accurate. Sweet.
as an apprentice over 60years ago we had a trade master who used to shout at you if the hacksaw wandered 2DONT GO TO SLEEP ON THE BLOODY THING LADDY, LET THE TEETH DO THE.CUTTING GOOD ADVICE worth remembering
Cutting the big end on connecting rods for my hot air engines I use a hot air engine powered power hacksaw with a junior hacksaw blade in it.The engine used is based on James G. Rizo's Dyna with 1 3/4" bore(it only takes about 15 min to cut 1/2" steel bar),it makes a perfectly smooth cut,and it feels good letting one model help build another!A lot of my engines have over hung cranks with ball races,but the others need to be split and are fitted with bronze bushes.
Must admit I was surprised how much more control a junior hacksaw gives.
I used a junior hacksaw to split the eccentric straps for my "Minnie" traction engine and ended with a good result. The cut ends of the straps were not that much off square either!!!!! For a small job the junior was more controllable than a big wiggly waggly hacksaw and allowed a little extra metal on the straps for final machining too.
In my young apprentice days we were alwaystold dont go to sleep on the hacksaw, LET THE TEETH ON THE BLADE DO THE WORK, thats what they are there for. In other words "there is no need to apply a lot of pressure on the saw, then the blade will not wonder.