Qualters & Smith Power hacksaw feed

  1. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    I've just gotten round to fixing up the Q&S power hacksaw I've had lying around in my workshop for some time since I purchased it as a scrap item from my former employment.
    After fabricating a new motor bedplate it's now resplendent with a single phase motor, new pulley & v belt.
    However, after lowering the blade onto the worKipiece & starting the saw, the hydraulic feed cylinder is jacking the saws frame upwards away from cutting & no matter where I position the the feed operating handle it refuses to lower whilst the motor is running.
    Anybody had experience of this make of saw or better still the operating instructions.
    Thanks in anticipation
    RonA
     
    • image.jpg
  2. julianthegypsy Member

    Messages:
    2,685
    Location:
    Cirencester
    I might be really silly here, but are you sure the saw is going the right way? From memory, it should be cutting on the backstroke. Is it single or three phase? Also, that lever twists as well as going up and down doesn't it? again, if memory is working, twisting it sets the rate of drop and up or down ie either up or down. Doubtless someone with better memory than me will be along shortly. Lovely bit of kit when you've got it running properly.
     
  3. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    Hi Julian,
    The thought the motor might be running the wrong way had occurred to me, however the motor shaft/pulley is driving clockwise (as most motors) & in turn driving the first pulley on the saw the same way. Perhaps somebody could confirm this is correct?
    The motor is single phase (as mentioned in my post) & you are right in your comments about the adjustment of feed rate (I have adjusted this from full up to full down, to no good effect) As you mention it is a good solid piece of kit & despite being in use for several decades it is still in good working order (hydraulics excepted). A good purchase for £40 I thought.
    RonA
     
  4. MattF

    MattF Forum Supporter

    Messages:
    9,874
    Location:
    South Yorkshire, England
    How does the lift setup work? Julian's suggestion sounds like a simple test to start with. Just turn it by hand counter-clockwise for a while and see what happens.
     
  5. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    I've just found a video on YouTube of an identical model in operation & it seems to have a small lever on the lift mechanism that is missing on mine. Will make up a lever (it seems to just screw in) & see what effect that has.
    RonA
     
  6. MattF

    MattF Forum Supporter

    Messages:
    9,874
    Location:
    South Yorkshire, England
    Let us know how you get on. Fingers crossed that's all it is. :)
     
  7. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    Hi,
    I made up a little lever, which turns out to be for increasing & decreasing the feed on blade (it fits in the small hole visible in the collar round the shaft, top of the hydraulic lifter, just visible in the photo). However, despite fitting the missing lever & trying every combination of feed setting & hydraulic lift lever, the saw still starts to lift away from the workpiece on commencing cutting. Anybody got any further thoughts/experience on this make of saw. Failing that looks like I'm going to have to remove the cylinder to find out what's going on inside. It has stood a very long time unused so the oil inside may not be in the best of condition.
    RonA
     
  8. julianthegypsy Member

    Messages:
    2,685
    Location:
    Cirencester
    I've just had another thought. I'm sure that when those saws went down, eventually something knocks that lever back up so it starts going up again. Looking at the picture, is that an adjusting screw, and can that little metal block be adjusted down away from the cam? It's a bit hard to describe but I have a feeling there may be an adjustment which has either slipped or been adjusted so far that it's constantly in the oops I'm at the bottom and ought to go up position, if that makes any more sense...again!
     
  9. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    Hi Julian,
    You're right there is a vertical (adjustable) knurled rod which, as you say, trips the feed lever, to make the frame go back up. However, it is currently screwed right out of the way, so I don't think that is problem. I've a feeling it's going to need a strip down & clean out of the hydraulic feed cylinder to sort it out. Unless somebody whose used one of these saws can point me at something else
    RonA
     
  10. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,296
    Location:
    Stockton on Tees, UK
    Hi to all who have been following & assisting on this thread,
    The good news is that the saw is now working as it should.
    However, it necessitated taking the handraulic cylinder apart to find out what was really going on.
    The problem turned out to be that the beveled washer on the bottom of the piston was not opening when the lever was operated to lower the saw frame. I've added a little diagram to illustrate how it all works. The small spring load rod which pushes the beveled washer & allows hydraulic fluid to leave through the piston (allowing the piston to lower) was not doing so, hence the saw arm was being pushed upward all the time. The operating rod screws onto the operating lever at the other end & had been screwed up to much( by whom remains a mystery, perhaps that why they decided to sell it for scrap) , resulting in the operating lever not opening the beveled washer. Now after a simple adjustment the rod is pushed in far enough & the saw frame descends as it's supposed to do.
    Many thanks for all those who contributed suggestions, it was a culmination of the excellent help which led me to the final resolving of the problem.
    RonA
     
    • image.jpg
    magnet likes this.
  11. julianthegypsy Member

    Messages:
    2,685
    Location:
    Cirencester
    Excellent news! I now have quaiters envy!
     
  12. scottmk1

    scottmk1 Forum Supporter

    Messages:
    914
    Location:
    Scotland
    RonA, what oil did you fill the hydraulics up with? I have a similar saw & whilst it feeds down, its pretty rapid so I thought maybe the oil in mine is too light.
     
  13. Woody.v8

    Woody.v8 Blue gluer

    Messages:
    2,953
    Location:
    staffs
    Mine uses the coolant for the hydraulics
     
  14. scottmk1

    scottmk1 Forum Supporter

    Messages:
    914
    Location:
    Scotland
    Mine has no coolant, is yours a more modern one?
     
  15. MattF

    MattF Forum Supporter

    Messages:
    9,874
    Location:
    South Yorkshire, England
    Seriously? That sounds like a setup which would be begging for trouble, either through corrosion or swarf ingress.
     
    Dieselkid 63 likes this.
  16. MattF

    MattF Forum Supporter

    Messages:
    9,874
    Location:
    South Yorkshire, England
    If that damper diagram is correct, just use an engine oil in there. You have a good amount of control over flow, and engine oil, (something like a 10/40), works fine in similar setups I have here.
     
    brightspark and scottmk1 like this.
  17. scottmk1

    scottmk1 Forum Supporter

    Messages:
    914
    Location:
    Scotland
    Got plenty engine oil in the workshop so I will try some of that in there tomorrow
     
    brightspark likes this.
  18. Woody.v8

    Woody.v8 Blue gluer

    Messages:
    2,953
    Location:
    staffs
    Don't know mate ?, all I know is it was like that from new maybe 50 years ago and it still works, I've had it twenty years and all i have done is changed blades and topped up/changed the coolant every now and again
     
  19. brightspark

    brightspark Member

    Messages:
    26,221
    Location:
    yarm
    that seems odd using coolant for the hydraulic. are they in seperate tanks ,water feed and damper mechanism
     
  20. Woody.v8

    Woody.v8 Blue gluer

    Messages:
    2,953
    Location:
    staffs
    No same main tank but there are several partitions and settling tanks then a gauze filter before the pump
     
Advertisements