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| surface grindy type project |
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| tom osselton:
Why don't you use a sliding gear that way you could have the fine feed and the more rapid travel? |
| shipto:
Theres much I would like to do but I am working on a shoestring budget (otherwise I may as well just buy a old surface grinder) with salvaged parts for most of the project. The gears are out of angle grinders and a drill, the screw is from a van jack etc. |
| PekkaNF:
My friend has a old surface grinder that the table traverse is done with a wire (cable?) no thicker that a moped/bike gear/brake cable. And it seem to work. If you can find a worm gear for slow speed, such as windshied wiper motor to turn drum (for cable feed), fast manual set would be pretty easy if the cable is tightened with a spring. Just a geometrical lock against the spring load, like a tool box spring lock or such? Pekka |
| shipto:
--- Quote from: PekkaNF on March 23, 2014, 06:21:56 AM ---My friend has a old surface grinder that the table traverse is done with a wire (cable?) no thicker that a moped/bike gear/brake cable. And it seem to work. If you can find a worm gear for slow speed, such as windshied wiper motor to turn drum (for cable feed), fast manual set would be pretty easy if the cable is tightened with a spring. Just a geometrical lock against the spring load, like a tool box spring lock or such? Pekka --- End quote --- Its not a bad idea however I have plans for the left-right back-forward movement of the table which will make it a set and forget machine. Definatly worth remembering for the future however :thumbup: This weekend had a fair bit of time to spend in workshop working on the gearbox for the lowering and raising of the grinder posted a few pictures which will make sense once I complete the bits and put it together. |
| shipto:
PekkaNF you have really done it now :hammer: I was merrily making this gearbox when I started to think about your comment and had a eurika moment followed by a :doh: for not thinking about this before. A much better way which would solve both the problems with feeding the grinder to the work and having a course feed for setting it close. If I can A) get hold of the correct tap for the screw I am using (possibly a 18X4 LH trapazoidal) and tap the center of a worm gear or B) turn the nut I already have and press it into a worm gear, I can lock the thread at the bottom to use the fine feed or let it free and turn the screw for the course feed, something like that shown in picture except the screw could be locked off rather than fixed. I hope you get the idea of what I am thinking. |
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