Recent content by Kpar

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. Kpar

    Valve Timing 4 Stroke

    This could be a long post but bear with me. I purchased a Chinese 4 stroke from Stirlingkit last year. Very happy with it until a grubscrew failed on the small gear on the crankshaft which jammed up on the larger gear on the cam side shaft, both gears suffered some damage. After a lot of shaky...
  2. Kpar

    Valve Seats

    Not the smartest kid on the block but have managed to build a couple of engines that actually run. I always have trouble with valves & seats and lapping them in. I just had an issue with a (bought) Chianese blue hit & miss which lost comp. through the inlet valve. When I dismantled it the valve...
  3. Kpar

    Thread Dial

    Thanks for that. Will do some experimenting when I get some free time Kpar
  4. Kpar

    Thread Dial

    Yes the spreadsheet would be a great help. That way I can understand your calculations. Kpar
  5. Kpar

    Thread Dial

    Thanks HCNZ, I have copied your table & will check it out. The thread dial has 24 teeth and as per previous post from djc I followed his suggestions. It's so much easer to drop the halfnut randomly & cut several met. threads.(thanks djc) Other threads I will leave the halfnut engaged & reverse...
  6. Kpar

    Thread Dial

    Good one Harvey
  7. Kpar

    Thread Dial

    Done a couple of more threads this morning, all ok. The drive shaft I mentioned is where the coupling for the leadscrew which has a sleeve & two roll pins (maybe I should change one to brass). Unable to get to the halfnut looks like a major job. Yes I managed to confirm the lead screw with a...
  8. Kpar

    Thread Dial

    An update to my issues. I ended up disconnecting the lead screw and found that there was a fair amount of float in the main drive shaft. Removed the forward reverse gear lever (BIG MISTAKE) and the yoke that slides the gear into place fell off. Had to dismantle a bit more to get it back. Anyway...
  9. Kpar

    Thread Dial

    I think you will find it's the angle of the camera shot Kpar
  10. Kpar

    Thread Dial

    This is where I got my info from.
  11. Kpar

    Thread Dial

    My understanding is if you use a normal metric thread gauge and align the tips to the center of leadscrew thread will give a correct pitch. I used a 3 pitch tab and it matched perfectly to the center of each leadscrew thread. Is this incorrect ?.
  12. Kpar

    Thread Dial

    Thanks guys I'm just a novice at threading and your comments has helped me more than Mr.Gogle & youtube. I'm getting on a bit & mind is slow but these posts have helped me a lot. Kpar
  13. Kpar

    Thread Dial

    Thanks Peter, Yes the bearing block at the TS end has elongated holes so adjustment is available. Will do that tomorrow. If i don't reply, All is Good.
  14. Kpar

    Thread Dial

    Peter what it is if I engage the halfnut (lathe off) and attempt to move the carriage back & forth with the handwheel The halfnut clamps to the leadscrew and holds firmly but the leadscrew has about 1/8" end float ?
  15. Kpar

    Thread Dial

    Thanks djc, Leadscrew is 24mm Dia, Pitch 3.0mm Dial Indicator gear 24 teeth. I guess this is how you measure pitch "center to center of thread"
Back
Top