surface grindy type project

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shipto:
Went with the altering the nut option in the end (see above) as wife couldnt get me the right sized tap it seems to be a special thread which are more expensive and harder to get hold of, no matter though its all going in the right directions now :thumbup:
As for locking the screw to use the fine feed I am simply going to have a locking bolt contacting directly with the screw it wont hurt if it chews it a little as it wont effect the feed.

shipto:
what a week :doh: car failed MOT last friday, which I expected but thought it would be too expensive to get through which it wasnt just cv boots, dodgy handbrake, drop links and a sidelight. do you think the bloody cv's would split from the shafts anyway what with that and helping a friend out with a pocket bike i didnt get much done to the project.
what I have done i havent taken pics of but I will get to it and I am pondering what to do about movement backwards and forwards. Side to side is easy I just dont know whats best for the other.
thoughts so far:
1)ratchet and pawl system turning a thread
2)very slow motor turning the thread (this would mean the piece would be moving in two directions while wheel is grinding might cause problems?)
3)stepper motor with either a thread or belt (a little bit more complicated but nothing the arduino couldnt handle)
opinions welcome :smart:

tom osselton:
Why not just use a bike chain fastened to both ends and hooked up to a stepper to drive them back and forth the same motion as a printer. To advance the table at the end of travel (possibly setable) it could advance the gear 1 or x amounts of teeth.

shipto:

--- Quote from: tom osselton on April 10, 2014, 09:30:11 PM ---Why not just use a bike chain fastened to both ends and hooked up to a stepper to drive them back and forth the same motion as a printer. To advance the table at the end of travel (possibly setable) it could advance the gear 1 or x amounts of teeth.

--- End quote ---
If I choose the stepper motor route I will probably do this although maybe with a toothed belt rather than chain

PekkaNF:
Traverse?

You may want to have a look on this project:
http://www.metallmodellbau.de/MINI_BONELLE_II.php

There are few pictures of omega drive type application halfway down the page:
http://www.metallmodellbau.de/pictures/MINI_BONELLE_II/MINI_BONELLE_II_504.JPG

Now, there is one thing you may want to consider, these relatively flexible drives are good for upphill or climb grinding as it happens on tool sharpening, but I would research and think to use this on surface grinding....analogous to up/down hill milling. You get by when you grind up, but on the return stroke you need very rigid grinder/drive or a ability to lift the grinding head during the return stroke. Maybe you have this already devised? I didn't fully follow all details.

Pekka

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