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| Finding a replacement gear |
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| Chuck in E. TN:
Well, they brought me the broken gear tonight. It has (had) 55 teeth, 2.345 dia, .377 thick with a .750 bore. It meshes nicely with the change gears from my Micromark 7x14 lathe. Thus, I would guess its metric Mod1. The person needing the gear showed me the webpage for a replacement set of 2 gears for the lift chair as a cost of over $90! Robbery! There has to be somewhere to get a suitable replacement for much less than that. I’ve checked Boston Gear and Stock Drive Products and they don’t list anything close. Any ideas? This is for a lift chair for a 83 year young Senior Citizen. Chuck in E. TN |
| Fergus OMore:
If you will settle for cast iron and a slightly different cog, the 9x20 lathe gears should be OK. It would need boring out but if you want a cheap solution, this might be it |
| andyf:
Hi Chuck, There's a steel 55T at Technobots (who will export) here in the UK for £11.53 (about $18, and being outside the EU, you won't have to pay the tax) plus shipping: http://www.technobotsonline.com/steel-spur-gear-mod-1.0-55-tooth.html They will be the same bore etc as some 60Ts I bought from them. One of those, before I started hacking it about, is shown in the first pic here http://andysmachines.weebly.com/new-banjo-dedicated-to-fine-feed.html (enlargeable version at the foot of the page). The bore is now 1/2", but I think they came as 10 or 12mm. The teeth were 15mm (about 0.6") across, and as you will see there is a big boss on one side, which gives somewhere to hold them in the chuck for boring. I then drilled/tapped a hole in the end of some square bar so I could bolt the gear to it, then held the bar in my bandsaw and sliced 8mm thickness (plus a bit to allow for subsequent facing) off from the bossless side. Subsequent deburring of 60 teeth on each side took ages. Andy |
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