That seems like a very reasonable approach to use a drill press, J20 x 2" dia sheaves are not readily available, but I have just found one J6 x 1.9" dia sheave from B&B which has a set screw
for $35. Perhaps I can grind the width down to fit on the Delco Remy SI28 shaft. Then I would have to use a J6 belt instead of j10.
The crank sheave I am planning to use is J10.
That would be far less cost than the $264 I was quoted for machining a properly dimensioned J10 x 2" dia. x 7/8" shaft dia sheave, with out using a bushing.
See this J10 x 2" dia (10J200JA) Sheave
$36.23 that requires a JA x 7/8" bushing
$7.50 is quite reasonable but I am concerned about two things with this sheave and bushing:
- The Delco Remy 28SI uses a nut and heavy washer to compress the sheave to torque of 70-90 psi which will compress the tapered bushing into the outer sheave and may crack something. The spec sheet shows a Torque Capacity (lb/in) 1,750 (See page 315 for the JA bushing which shows Torque Capacity as 1750 lb/in.) So now I wonder if this bushing would work, if I can get it to fit!
- The thickness of the sheave needs to work with the Delco Remy 28SI shaft and and compression nut. The bushing flange is .313" and the full thickness of the bushing is 1.0". I believe that the shaft may be longer than 1" so perhaps additional washers are needed or something.
Should I just try the sheave and bearing above?