I posted the initial news of the J&S in the tool acquisition thread but the continuing adventures should have their own -
I've been looking at it off and on for the last week trying to work out where to start. I have appeals on PM, modelengineer.co.uk and some others to try and get some information. Today the brochure (reproduction) arrived from Tony (lathes.co.uk) and in there was some interesting stuff about the drive system. I did not expect to find one, but it actually has a rear view of the countershaft arrangement. While not necessarily wanting to duplicating it, it is interesting to see the complexity involved.
rear view (Medium).jpg
Maximum rpm suggested for a 5" wheel on this machine is only 3900rpm but as the wheel is consumed there are 2 other speeds so that it can be run efficiently. When you are down to a 3" diameter wheel they suggest hooting along at 6750rpm. Still debating whether to run two VFD's (one for the grinder, one for the workhead) or have a similar set up with several counter shafts. The extra motor + VFD + switch gear etc will probably come close to $500 but would be a lot simpler. (Come to think of it, belts pulleys and bearings would come to...)
Another similar machine (brand is Crystal Lake) had a overhead shaft and in this photo you can just see the long roller for driving the traversing head.
grind.8056.2 (Medium).jpg
Michael
I've been looking at it off and on for the last week trying to work out where to start. I have appeals on PM, modelengineer.co.uk and some others to try and get some information. Today the brochure (reproduction) arrived from Tony (lathes.co.uk) and in there was some interesting stuff about the drive system. I did not expect to find one, but it actually has a rear view of the countershaft arrangement. While not necessarily wanting to duplicating it, it is interesting to see the complexity involved.
rear view (Medium).jpg
Maximum rpm suggested for a 5" wheel on this machine is only 3900rpm but as the wheel is consumed there are 2 other speeds so that it can be run efficiently. When you are down to a 3" diameter wheel they suggest hooting along at 6750rpm. Still debating whether to run two VFD's (one for the grinder, one for the workhead) or have a similar set up with several counter shafts. The extra motor + VFD + switch gear etc will probably come close to $500 but would be a lot simpler. (Come to think of it, belts pulleys and bearings would come to...)
Another similar machine (brand is Crystal Lake) had a overhead shaft and in this photo you can just see the long roller for driving the traversing head.
grind.8056.2 (Medium).jpg
Michael
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