Wrap around the pulleys is way more effective than higher tension. I would be concerned that the higher pull on the belt will either overload the plain bearings (if that's what your lathe has) or flex the shaft. Using a snubber idler would be effective if you can make room for it. Also with flat belts, longer is better since it damps down shock loads that are often what starts the slipping. My lathes are all set up with wall mounted pulleys and long belts, together with a lightly sprung snubber. Never any issues with slipping despite very low belt tension.
I really don't think the tension is that significant. Yes more than it was but still not excessive. I designed and built the drive so I don't have a comparison. I do agree that the snubber is a good idea.
Heck, I never had V-belt slippage on my 9” SB between the motor and the countershaft. It was ALWAYS with the flat belt on the cone pulleys. I always ran a leather belt with a long, scarfed, leather-to-leather joint glued together with Titebond. Very quiet that way, no click-click-click from the finger loop joiners. Belt dressing helped with slippage but had to be applied frequently. It’s also difficult to obtain leather belting that doesn’t stretch under tension.
It was the flat belt slipping. This flat belt is a synthetic belt that will not stretch more than maybe 1/8". The adjustment increased the tension on the flat belt mostly.
@@WinkysWorkshop Aha, I did not catch that. The tension on my SB was an adjustable toggle linkage between the headstock and the pivoting carrier for the jackshaft and motor. It worked effectively like a turnbuckle to lengthen or shorten the linkage, and pushed the carrier away farther from the headstock, thus tensioning the flat belt. I could have used a synthetic belt.
Hello Mark, yes I made the grinder to grind flat belts. When I retired from the printing company I prepared all there belts for 3 year. I made it from surplus machine parts from the presses and binders. I didn't want to do it but they pretty much told me to name my price. I made about 20 belts a week for 3 years. Not a lot of money but a very good hourly rate.
Try to increase the amount of belt wrap on your pulleys. Maybe an auto spring tensioner or something similar. The percentage of pulley wheel wrap may directly correlates to less chance of slipping. Funky setup with all that stuff hanging off the back of the lathe.
It's not uncommon to have the drive on the back. Many south bend have the same. They also have 1/2 wrap on the flat belts but with a cam to tighten the belt. I do agree that increasing the wrap makes a significant difference but the additional tension I applied is definitely not excessive. When I designed the drive the amount of tension I'd have was a guess. It depended on the motor weight, position and angle. It's been lacking tension for a while. I have compared the amount of tension to similar lathes. I still have much less tension than most but a lot more power at the chuck.
i didnt expect to find the brand of my lathe, i bought it in east Germany, i coulde`nd figur out why the dials are slightly of with my indicator (never tought about inches when i read 2.53mm on the indicator. becaus its 1 100 of. spechely because every other thread is metric) and why ther is a 63 tooth gear. sadly it hase 1/10 mm play in the spindle bearing and i only have the gears for metric threds
Years ago i had a old Hercus Lathe with flat belts, someone took a Centrepunch and punched all over the Pulleys to stop the Belt slipping.......ok it was me, don't judge me it worked 🤣
@@WinkysWorkshopOne of the first motors I serviced during training. Replace the brushes and spiff up the commutator every 20 years. 50 lbs per horsepower. Most likely every one of those ever made could be refurbished and put back in service. Ultra versatile traction motor
@@thaiexodus2916 It's a good motor and yes VERY heavy. I think mine is 50 lbs per 1/2 HP! When I got the motor it would occasionally fail to start. I took the "necklace" out and cleaned it all up and it's worked perfectly ever since.
I sent ya a email with my lathe some time ago. I pretty much copied what you did with the mount but my drive is really close to my lathe and my motor is within a inch of the ground. I also have some angle in it. I haven't put my lathe to any serious use yet but I don't have any signs of slippage. Mike.
@@thercbarn5001 Mine is old... maybe 80lbs. I used to fly RC. It was a lot of fun but I had too many iron in the fire and sold out. I always thought it would be cool to have a laser cutter to cut the wood.
@WinkysWorkshop yes it would. Maybe I should send you my project. I wanna take 4 saito cylinder heads and make a custom 4 cycle 4 stroke. That's cool that you used to fly!
