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| Another manual RT to stepper control |
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| Bogstandard:
Bill, This stepper was supplied to me as just something to fit into the holes I made. But on this page, the second one down gives the details of it. The 180 Ncm one. http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Motors I know less than nothing about what steppers can be used, but I am sure there are lots of people on here, much more knowledgeable than myself about them, who should be able to assist you. I am about to fit the same motor to my own Vertex BS0 dividing head, and was the same as the one I used for my 6" Vertex RT. John |
| John Stevenson:
Fits well to a BS0, uses virtually the same gear as the Vertex tables. John S. |
| BillTodd:
Thanks John & John The motor doesn't look quite as big in JS's picture (that Rotab must be tiny), so I might be able to use something of similar size after all. The plan BTW Johns (plural ;)) is to build a 5" electronic dividing plate (using Kwacker's PIC code), that'll fit my Victoria head in place of the conventional plate and allow it to work in universal mode i.e. it will spin with the gears. Because it will rotate , I'll want to make it battery driven, so applying current to hold the motor may not be a great idea (It'll have to have enough holding torque to make a cut). I'm not sure yet whether to use a worm gear or perhaps a solenoid brake instead. I'll start a new thread in the design forum when I get started in earnest. Bill |
| Bogstandard:
Bill, The table I modded is only a 4" one, so yes, it is rather small. I think they always look slightly out of place because you have to make room for the Oldham coupling, which in reality is a necessity for this type of inline setup. A largish looking motor hanging out in mid air on the end of a tube, rather than being bolted direct to the RT. I don't think you could shorten the tube any more than I did in this mod. I suppose you could do away with the coupling and mount the motor to one side, with either a gear or belt drive between the two shafts. John S, Thanks for the piccy, now I can envisage what mine will look like. It should be a fairly easy conversion because I am not going to be fitting any thrust bearings on the worm shaft, I am hoping it doesn't need any, unless you can advise otherwise. John |
| John Stevenson:
No, all I did to mine was to cut the thread off where the nut goes on, [ I can tap it and fit a stud if i want to make it manual again ] bore an Oldham coupling out to fit over the flatted shaft, 12mm Ø if i remember correct and make a top hatted closed end sleeve up with 3 holes that pick up the division plate holes. This sleeve is bored 1 1/2" at the outer end to accept the stepper register but then it has to open out internally to allow the 3 cap screws to sit in the 3 holes. That was it. John S. |
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