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| March/April 1990

2567 Hesperia Road, Bradley, California 93426.

After stripping off all the old fiber material from the spider, I mounted it on, using the original shaft for an arbor. You have to use the original bearing or similar spacer behind the taper lock. I machined the OD and ID of the bosses, faced both sides of the hub (one side has a taper), and even took a cut on the outside of hub between spokes. This was accomplished by moving carriage out and around the spokes and turning the chuck by hand. This was necessary because my spider was off about 1/16'. Don't forget to face bosses and leave edges sharp. Cut only enough on OD of bosses to cleanup on all four; on mine I had to cut about 1/8' off the bosses to do this.

Now you need some wood that won't split. I cut an oak burl and roughed out two pieces approximately 10' x 10' x 4 1/2' with a chain saw. I chucked each in lathe (four jaw chuck) and bored I.D. to approximately 5 1/2'. Now you can chuck them on inside and machine O.D. to approximately 9 3/4'. Finished diameter is 9 1/2' x 8'. Finish facing. You now have two half pulleys.

Now chuck on outside and turn a groove in face 1/32' in depth to match one side of boss end. This will locate spider in center of pulley. Counter bore for hub one-half of thickness of hub in depth with approximately ten thousands press fit. (Remember wood will give.) At this time cut a diameter mark for bolt holes 8 1/2'. You can at this time taper the bore. I left mine 5 1/2' at center for maximum strength and 7 1/2' bore at outside, 5 1/2' will clear P.T.O. hub. Now do the same with other half of pulley. Remember one side of spider hub has tapered face. On this half omit bolt hole circle.

Now on bench, lay the spider in groove you cut in pulley, face and mark around the bosses (they are not evenly spaced as you have noticed). Drill holes where marked, as large as possible without going outside of marks. The bosses are elongated. Set spider on holes and tap lightly with a hammer. Sharp edges will cut their own shape in wood holes. I removed spider in approximately 1/8' increments and cleaned holes with special ground chisel. Special care should be taken so as to avoid breaking the spider as you remove to clean holes. When spider spokes contact pulley, mark around same and with wood chisel cut this material out between bore and boss holes. Leave a tight fit (again wood will give). It is not necessary to install spider anymore.

Repeat this same procedure on other half of pulley and other side of spider.


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