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  1. Gordon

    Upshur Twin valve timing

    Just to keep life interesting the loctite holding the timing gear on the crank shaft let go so I have to take everything apart again and fasten the gear to the crankshaft. Life is interesting if not fun.
  2. Gordon

    hauling a small mill

    In most cases purchasing a single phase 2 HP motor far exceeds the cost of a VFD. Plus there is a good chance that the motor mount will have to be modified.
  3. Gordon

    Upshur Twin valve timing

    Drawings were published in Model Engine Builder magazine #7 and #8. The plans are also available direct from Upshur. Google still works. https://rocketr.net/sellers/UpshurEngineWorks
  4. Gordon

    Upshur Twin valve timing

    OK Thanks for the input. I think that one of the problems with the valve timing is that both valve are actuated by a common cam. This means that adjusting intake also adjusts the exhaust. The ideal would be to make four adjustable cam lobes but that would be pretty difficult in an engine this...
  5. Gordon

    Upshur Twin valve timing

    I am looking for someone who has built the Upshur Horizontal Twin. The instructions on valve timing are very confusing. I presently have the intake valve opening at TDC and the exhaust valve opening at BDC. Due to the design it is not possible to change the timing of the intake without changing...
  6. Gordon

    hauling a small mill

    I have moved milling machines in the past with a boom type wrecker as used for disabled automobiles. It allows you to sling it from the top. If you talk to the company and let them move it at a time when they are not busy they may give you a better rate. Works great.
  7. Gordon

    3D printed bevel gear

    It is too much work to tear the saw down to actually try it but as near as I can tell it should work, or at least work when/if I print it using ABS. The bore seems to be a little tight but it probably can be pressed on or at worse run a reamer through it.
  8. Gordon

    3D printed bevel gear

    Here is the final result.
  9. Gordon

    3D printed bevel gear

    I printed it using PLA and it looks good. I have not tried it on the machine but it looks right. It did indeed take 8 1/2 hours. The Monoprice is a very basic and cheap machine and for the few times I use it it is just fine. It is not like I have to stand there and watch it. It was still working...
  10. Gordon

    3D printed bevel gear

    OK That was easier than I thought it would be. I just rotated it in CURA and started a new print. Looks OK so far. It is going to be working on this after I quit for supper. Says 8 hours and 26 minutes. It is going to work without supervision. Than you. Gordon
  11. Gordon

    3D printed bevel gear

    I just stopped the print because there is not enough support on the piece and it is too unstable to print. There must be some way to rotate it so that the gear is setting either on the hub or the face. Beyond what I know how to do at this point so I will have to try to educate myself. I played...
  12. Gordon

    3D printed bevel gear

    I have loaded it into my printer and it is printing now. NOTE: I am not an expert on either 3D cad or 3D printer. The earlier version by John was 35kb and this one is 5256kb. I tried printing the one from John and it just gave me single layer. This one looks t be correct except that it is...
  13. Gordon

    3D printed bevel gear

    I have only used PLA. I have a Monoprice Mini printer. I am not sure if it will use other filaments. I will have to do some more investigation.
  14. Gordon

    3D printed bevel gear

    Played around with it a little more. I have the part showing but I still need more work. More later after I take care of some other stuff
  15. Gordon

    3D printed bevel gear

    John has generated an STL and and a PDF but I am having a problem loading it into my software. I am sure that the problem is with me, not the files.
  16. Gordon

    3D printed bevel gear

    I am a long way from an expert on 3D printing and I have not used it for a while but I tried loading your stl file and I am not getting any thing on the Z axis. Just a flat outline. I will try again later when I get more time. I am using Ultimaker Cura software. I am sure that it is operator...
  17. Gordon

    2021 just like 2020

    There is no cavity to fill. The head is flat. I have done the valve lap steps but it certainly will not hurt to try again. Sometimes we are too easily satisfied and move on before we are 100% sure. At least I do.
  18. Gordon

    2021 just like 2020

    My next step is extended runnin under power. I made a sheave to fit on the crankshaft so that I can hook it to an electric motor. I wall also try lapping the valves again.
  19. Gordon

    2021 just like 2020

    I have one of those but the volume in these small engines is not enough to actually register. The air in the cylinder just inflates the coil in the gage.
  20. Gordon

    2021 just like 2020

    The head is completely flat so I cannot fill a cavity to test the valves unless I machine a false cavity ring. The thing that has me the most confused is why the rings seem to seal better in one direction than the other. This is true even when I remove the head and seal the cylinder with my hand...
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