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About Jim1934

  • Rank
    Advanced Member

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  • Gender
  • Location
    Clarkston, Michigan
  • Interests
    Metal machining
    Wood working
    Amateur Radio
    Repairing old machinery
  1. Boy, that is a good thought. That would explain the pulley which was obviously not a factory installation. It is welded in place with a awful looking weld. So perhaps they ran engine full out while cutting and were not concerned about taxing the engine. It had to be a low production operation from the look ofthe original site. Thanks, Jim.
  2. Good thinking. No, I cannot tell. Throttle is unlike any I have seen. Operator, by some method, rotates a vee belt pulley which turns a screw which in turn extends or retracts a rod linearly. Rod and screw are enclosed in a pipe. Almost think it was remotely controlled. Thanks for the thought. Jim
  3. Hi W, No, weather too wet and cold for this old guy. Rained most of the week. Temp. low 40F. Son is busy trying to get pool and "toys" ready for winter. Had a frost this week. Did determine that the feed rate is about 4" per rev. of saw blade giving a chip about 0.1" thick which seems to be what is recommended. Wondering if the 11' distance between motor shaft and saw arbor is OK. Some expert says it should be 15 to 20 times dia. of smallest pulley. Smallest pulley is about 9" dia. so I hit lower limit. If I increase it to 12" to speed up saw arbor may need to increase spacing. Of course I have no experience to go on. Engine channel iron frame now sitting on bare ground but think we must pour a substantial pad to prevent belt tension /rain from causing tracking and slipping problems. And, need to find out why two exhaust streams are so different. A great Thanksgiving to all. Jim.
  4. Best I can come up with is the engine rpm at max torque (424 lb.ft.) is 850 for a UD-18. Equates to 68.6 HP. Published 'Rated" rpm is 1400 . If you ASSUME the published max. HP is at 1400 rpm that would give a second point on the T-S curve of 1400 rpm, 375 lb. ft. of torque for 100 HP "max". Not an engine expert. Cant find a T-S curve. Jim
  5. Assume engine runs at 1000 RPM., about 70% of max. Engine pulley is 9 in. dia. saw pulley is 25.5 in. dia. Saw will turn (1000) x (9/25.5) or 353 RPM. Do not know hammered speed. Want each tooth to take 0.1 in. thick chip. There are 44 teeth on the blade. So for each rev. cart must move 44x 0.10 in. or 4.4 in. Cart speed= 4.4 in/REV x 353 rpm or 1553 in. / min. Time to cut a 10 foot log=(1/1553)x (10) x (12) x (60) = 4.6 seconds, which is about twice as fast as I time on some fast Utube mills. If I want to speed up the blade RPM, and have a cart speed I can handle, I am going to have to change out 3 pulleys, which I don't have. So, if saw will run ok at 353 RPM I will be satisfied. If cart speed is too fast changing one pulley wii slow it in cut direction. That is the way I see it now. I have no idea if the cart is geared as I assumed above. Will try to determine that this weekend. Results may change my thinking. Thanks for input. Will let all know how it turns out. Jim
  6. Strange thing is that the pulleys are same diameter as those on the mill when it was in operation. The one on saw blade arbor is the original; I made the one on UD-18 using its damaged original as a pattern. At the time I had no other info. to go by. No argument- just info.
  7. Strange thing is that the pulleys are same diameter as those on the mill when it was in operation. The one on saw blade arbor is the original; I made the one on UD-18 from scratch using its damaged original as a pattern. At the time I had no other info. to go by. I can rebuild UD-18 pulley. Could also look for smaller one for saw arbor. What is the physics that says a larger pulley will track better than a small one ? More friction is true, perhaps that is the reason for better tracking. Just asking. Not disagreeing- just reporting the facts as I know them., Jim
  8. Thanks to all on speed issue. Appreciate it. In next few weeks I hope to pull that slip/ over ride clutch and see if it can be repaired. Son says it contains is a wooden pulley that is free to slip on the shaft at an overload. Pulley is connected to shaft by helical springs under normal running. Wood is shot. This pulley drives another one that eventually drives gears and manual clutch that moves the cart into the saw. When I get apart I wii post pix for your viewing pleasure and excitement. Jim
  9. It is a "Knight" mill. Probably has other brand name parts as replacements. It was in tough shape. Not sure of speed yesterday, but with JD it was about 250. Probably about same yesterday as were had diesel just above idle trying to get belt centered.
  10. Thanks- have not tried to find problem- but we will. Is the front at radiator end or output end. ? My memory is shot. Priority now is finding a way to reliably transmit power from UD-18 to mill pulley-quit throwing flat belt. We also have what we think is called an "over-ride" clutch on main saw blade shaft that does not work. Basically a pulley that is connected to saw blade shaft, or not, by coil springs. A fools work is never done. Jim
  11. Tried cutting in spite of drizzle. Finally got flat belt to stay on until we actually started cutting the 10 in. pine log. Got 2 feet into cut and belt came off wooden drive pulley. Everything was wet and slippery Also feel we need better control of feed rate. Stay tuned. Thanks for suggestion. Try this utube link. https://youtu.be/WkUmkUzMaak Jim
  12. Good questions. Not sure of the answers. I know we cannot find any info on the 54" blade regarding the hammered speed, so to speak. Will ask son about PTO speed that day and let you know. If it was 540 that should be in the ballpark, but I doubt if he ran engine at max speed. Don't know if JD has multiple speed gearbox for PTO. Was going to saw today using UD-18 but it's raining. I don't work well in the rain. Jim
  13. UD-18 American Bosch Injector Pump Questions

    Oh No, can't do that. What is wrong with it? I wouldn't mind finding a decent 4 cyl version. But I am a glutton for punishment.
  14. Before it was abandoned in a field, along with its sawmill, it was the prime mover for the saw. It wii again power the saw. Its on my sons property and he has no thoughts of a commercial venture. We both hate to see old machinery that served so well return to the ground as rust. In the video its being driven for tryout by a 27 HP JD tractor. Try this link : Jim