Shopsmith Forums

If the motor spring will not let that dimension get to 2.08, then that should explain why people cannot get to 700. Mystery solved? As for the belt dropping inbetween the sheaves on the low speed end, I think that could happen but only for a narrow or worn belt (the belt width shown is a full .59&q...

For those of us who are measuring geometry within the headstock, the attached drawing is supplied. Shows what the drive geometry should look like, and measure, when running around 700 RPM and using the "Official Shopsmith Belt". All the circled dimensions should be measurable from within ...

Here is a graph of the speed data I provided earlier: 520 Speed Chart.png Nominal is from the speed chart, Main (RPM) is measured, Main @3450 is projected speed at the full load speed of the motor. In this case I calibrated the speed dial at K using the tach, as opposed to the method used in high s...

Dave I need help that I hope you can provide. I am attempting to understand the differences between your numbers and mine. If you would do the following for me it would help me greatly in getting to the understanding. What I would like to know is this: With the speed dial set so that your idler sha...

You may observe that almost all 'discussions' involving trying to gain greater understanding of the beast will include the same participants roaming here. Not all come to the same conclusions however. But all gain by their involvement. Your observations are spot on but I have come to the conclusion...

Thanks. That is about as close as I would hope given what we are dealing with. But I still don't understand the big differences.

Dave I need help that I hope you can provide. I am attempting to understand the differences between your numbers and mine. If you would do the following for me it would help me greatly in getting to the understanding. What I would like to know is this: With the speed dial set so that your idler shaf...

Very interesting. Thank you.

My machine numbers are much different . I have not taken a thorough set of readings like yours but I have enough to see that I have work to do. Maybe my machine can get to 700 if I do a better job of maintenance. Thanks again.

Tiny differences in measurements will make a surprising difference in calculated results. I am talking third decimal differences. Measuring accurate
operational radii is very difficult.

I consider the high speed stop's only function is to preclude the control sheave from interfering with the speed control parts by opening the pulley too far. There might well be another purpose, but every thing else in the drive train is mushy.(wear, belt stretch. . . .) I agree but that does have ...