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| Building the Division Master and modding my RT |
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| madjackghengis:
Hi John, I'm looking forward to seeing the finish of this project, and seeing it put to use. As you do, I intend to extend my useful working life by such measures, and not be stopped in my working pleasures by physical infirmaties. I've got a cam blank bolted to my rotary table, waiting for me to either machine the cam manually or put a drive on it and do it with accuracy and power. From the sound of it, you should be ready to show us how it's done most ricky tick, and turn on the light for us out in the dark. :poke: mad jack |
| Bogstandard:
Nick, It isn't just this that I dropped. A while back I had just finished a lovely running and blinged up stirling engine, and as usual, without thinking, I picked it up with my right hand. It is now sitting in a box waiting to have a new built up micro crankshaft making. Something like this happens weekly with me. This time, Lester came to the rescue, I can't thank him enough. Jack, Whoa!!! slow down a bit. I'm still waiting on a piece, when that gets here, I will do my best to get things moving again. Your problem is the same as mine, and when I played about with the programming, turning either way by just pressing a button was one of the first things I learned to do. I can see that bit of the program being used a lot. It only took a couple of minutes to pick up how to do it, no mind numbing or long winded procedures to follow. John |
| arnoldb:
Thanks for showing your modification John; I'm sure it will be very beneficial to your shop time. Once you have it going, it would really be appreciated if you could do a post-up of how it works and performs in operation; Ive noticed that it has no direct feedback mechanism to provide positioning information back to the controller, so I assume that the software will have a feature to set up for backlash calibration and compensation and so on; hence my interest in your operational findings. I've had a look at the features available for using a motorized RT and was quite surprised by what I saw. It could be really handy, and is worth a definite consideration in future - once I've mastered some more manual operations to improve my own feel and experience. Kind regards, Arnold |
| Bernd:
Sorekiwi, Thanks for the reply. Going to follow Bog's suggestion. Bog's, I'll check out those threads you mentioned. Didn't follow them that closely. Interest wasn't there at the time. As I sit here surrounded by my shop I got to thinking of what projects I wanted to do. Seems like all needed some kind of tooling. Next question was, do I make it or buy it. Looks like some will be bought and some made in the shop. Bernd |
| Bogstandard:
I have had a short look at that part Arnold. It does have backlash compensation, for the times you have to go back and forth. On the return journey, it overshoots the start mark by whatever amount you wish to enter, then it winds itself to the start mark again, ready for the next cut, and taking out the backlash. Of course, while this is all happening, you would retract the cutter if you were doing a slot. I want it to cut both ways, for making deep slots, and for that reason, I need to eliminate as much backlash as possible, and hopefully, it will be close enough to what I want without using the backlash compensation. Or if it won't do it, only use backlash compensation on a final cut sequence. I will do my best to put it thru it's paces, but other projects are pulling me ever and ever harder towards them, and I expect a lot of my learning curve will be done 'on the run' while working with other projects. The operational and programming manual is very good, and really it is a matter of using your imagination as to what it could be used for. Each time I look at the thing sitting on my kitchen table, I think of another use it could be put to, and go back to the manual to see how it can be done. It really is a lot more than a precision indexer for drilling holes. That is another thing I need to mention. This unit can be used on unmodified RT's, you just need a method of getting the stepper to turn the input shaft. I will be modifying mine, not only with a thrust washer system, but with a home made Oldham coupling end that screws onto the spindle rather than using the plain portion where the normal turning handle fits. So there is no need to follow my internal mods at all if you don't want to. I am just trying to squeeze every bit of backlash out of mine. It might work, it might not, but unless you try it, you don't know if it will succeed. John |
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