- Joined
- Apr 27, 2016
- Messages
- 57
Thanks Brino,
Wanted to add this in case anyone with a Honden lathe has had the same problem and for reference if needed to make one. The lead screw has a sacrificial shear pin hidden inside the gear turning the lead screw that is suppose to be made of brass and the pin breaks when there's a crash. If the shear pin is brass, then the brass could break under normal & proper use completely on its own after use because of the all hardening from use (pressure) making it brittle over time and hopefully also breaks when (if) you crash the carriage and not damage the bushing. I cant find any of these bronze bushings and had to make one myself.
My lead screw shear pin diameter measured at 3.11mm x 13.5mm long. I recommend making several brass pins at a time and keep them close by for when they fail, it's fairly easy to swap out. The previous owner of my lathe had used a steel pin and it had partially shattered the bronze keyed bushing that the pin locks into. It would sometimes work moving the carriage when engage and then sometimes it didn't; I would scratch my head wondering why it was doing that until I noticed the damaged bushing. I suspect several other Honden lathes will have this same problem when the same cowboy fix job was utilized with non brass material laying around the shop. Thankfully, its not hard to fix.
The size of this bronze bushing is OD: 14.00mm x ID: 10.05mm x 14mm-16mm long and slotted to accept the shear pin, the keyed portion is 3.95mm wide, the interesting part is the height of key, the keyed spacer that that goes in after the gear is only approx. 1.5mm above the OD radius of bushing but the keyed slot in the gear is much taller, approx 3mm. Yours may measure slightly differently as mine has taken some abuse. The keyed bushing and shear pin has to fit inside the gear and a keyed washer/spacer. I hope you find this useful.
Here are several pics for reference of the old busing in this photo album:
Wanted to add this in case anyone with a Honden lathe has had the same problem and for reference if needed to make one. The lead screw has a sacrificial shear pin hidden inside the gear turning the lead screw that is suppose to be made of brass and the pin breaks when there's a crash. If the shear pin is brass, then the brass could break under normal & proper use completely on its own after use because of the all hardening from use (pressure) making it brittle over time and hopefully also breaks when (if) you crash the carriage and not damage the bushing. I cant find any of these bronze bushings and had to make one myself.
My lead screw shear pin diameter measured at 3.11mm x 13.5mm long. I recommend making several brass pins at a time and keep them close by for when they fail, it's fairly easy to swap out. The previous owner of my lathe had used a steel pin and it had partially shattered the bronze keyed bushing that the pin locks into. It would sometimes work moving the carriage when engage and then sometimes it didn't; I would scratch my head wondering why it was doing that until I noticed the damaged bushing. I suspect several other Honden lathes will have this same problem when the same cowboy fix job was utilized with non brass material laying around the shop. Thankfully, its not hard to fix.
The size of this bronze bushing is OD: 14.00mm x ID: 10.05mm x 14mm-16mm long and slotted to accept the shear pin, the keyed portion is 3.95mm wide, the interesting part is the height of key, the keyed spacer that that goes in after the gear is only approx. 1.5mm above the OD radius of bushing but the keyed slot in the gear is much taller, approx 3mm. Yours may measure slightly differently as mine has taken some abuse. The keyed bushing and shear pin has to fit inside the gear and a keyed washer/spacer. I hope you find this useful.
Here are several pics for reference of the old busing in this photo album:
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