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| "F" for fail, making new tooling... |
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| John Hill:
First step, saw off a chunk of mongrelium.. IMGP9169 by aardvark_akubra, on Flickr Put it in the lathe and didnt forget the first step which was to drill and tap the end to 12mm.. DSCN0309 by aardvark_akubra, on Flickr Quite a bit of swarf later and I had a very rough looking stub of taper and some 1 1/2" 8TPI thread.. DSCN0314 by aardvark_akubra, on Flickr It took ages to get a smooth finish to the taper but eventually it fitted to the rotary table allowing me to mount a threaded face plate on the rotary table and drill it to mount a chuck. IMGP9168 by aardvark_akubra, on Flickr I made another threaded taper, this one MT3 and it fitted the chuck to the lathe. Turned the end of a piece of scrap and needless to say the needle barely wavered when I tested it, as one would have expected... IMGP9172 by aardvark_akubra, on Flickr Then the chuck was spun off the thread and moved over to the dividing head....... run out was not so good..... IMGP9173 by aardvark_akubra, on Flickr The crunch test, mounting the chuck on the rotary table...... the run out is no laughing matter... IMGP9174 by aardvark_akubra, on Flickr I need to find some better steel and have another try after figuring out more accurate sequences to the machining. |
| picclock:
Would purchase of an MT2 to MT3 adapter resolve the issue ? By using this the threaded part is unchanged, and it is likely this that is causing the error. (and you get another bit of useful kit :headbang:) Best Regards picclock |
| Bogstandard:
John, It isn't just a matter of the thread. You require plain registers to keep everything aligned. The thread can be almost anywhere and anything, it is the face that the base of the plate hits that keeps it perfectly upright, and the upright register attempts to keep runout to a minimum. Have a look at this piece in this topic, it is what you are attempting to make, notice the bottom part of the threaded part, two registers, one horizontal, one vertical. Ones matching them should also be on the removable plate. http://madmodder.net/index.php?topic=422.0 John |
| John Hill:
Thanks guys, I am sure you are right John in that the register is what is missing, I have one on the lathe adapter but not on the rotary table. Obviously thats where I should begin.. :scratch: |
| Bogstandard:
I know it can be difficult for you where you live John. But like everything else, I would like to make everything myself, but most times, with something like this, I would always go the route of buying part machined backplates, as they already have the correct registers machined into them. In fact, for me to make one, although easy enough to do, it would be twice as expensive to purchase the material plus the time spent making than buying a commercial one. In fact, I will be purchasing a couple of spare backplates soon, when I next prepare an order. It will be handy having them in stock, just in case I come up with a new idea for some new tooling I want to make. I already do that with blank 2 & 3 MT's and R8 arbors. To me, it isn't worth not having them in stock if you are into making bits for your machines. John |
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