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| John Rudd:
I have an 80mm 4j chuck and need to make a back plate for it.... I intend to use 85mm dia CI, 25mm thick... Any tips on the machining process before I make a complete cock up of it......? |
| John Rudd:
The latest.... Well the backplate fits ok and I managed to drill it to take the chuck retaining bolts and tapped it thru M14*1.... Second phase was to machine a soft end arbor for it...Duly acquired from ArcEuro...I proceeded... I realise this thread is a POC without photos.....I didnt take any..just as well because the whole job has been one complete nightmare...... Once assembled, the chuck srcewed onto the mores taper adapter has more than an acceptable level of runout :doh: So its scrap... Plan B is to get a 125 mm backplate for my 9*20 and modify that to take the small chucks..... Laterz... |
| andyf:
Just wondering, John - on the arbor, did you put a plain register section behind (and a bit bigger in OD than) the threaded section, with an even larger diameter shoulder behind the register? A plain section inside the backplate, bored to be a very good fit on the register, would do the locating when screwed on to butt up against the shoulder. (He asked, being one who has never tried to make a backplate :scratch: ) Andy |
| John Rudd:
--- Quote from: andyf on December 06, 2009, 10:23:03 AM ---Just wondering, John - on the arbor, did you put a plain register section behind (and a bit bigger in OD than) the threaded section, with an even larger diameter shoulder behind the register? A plain section inside the backplate, bored to be a very good fit on the register, would do the locating when screwed on to butt up against the shoulder. Andy --- End quote --- Yes....did all that...In fact the register was 14mm on the arbor and a smidgen over on the backplate.... |
| fluxcored:
Hi John, I'll have to go through the same pain soon. What's putting me off is that I have'nt got the correct change gears to cut the backplate's internal thread so that it can fit my spindle. I'm scheming to fabricate the 32T change gear I need myself and am psyching myself up to start on that since it'll most likely end in failure. One step at a time. Regards. |
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