Hello Guys, thanks for looking in.
Now you didn't say Whiskey but which two holes are they
Never fear Bill I know just what the old boy is up to
The info on clearance is interesting Neil. I usually reduce the shaft in front of the bearing but not as much as you are suggesting going for more of a seal than allowing too much leakage. All made so far of course (save that Racer previously mentioned) have run without issues and though running fast at times are not running at anywhere near peak RPM's which would probably make a big difference. Given what you are saying and AS's comment on the bore being opened offset I think I will increase the annular gap slightly more than before on these, maybe one more so than the other for comparison.
All assuming of course that we end up with decent cases
As said yesterday it was a case of the old two step shuffle - one forward one back. I had set up on the face plate to rough turn the front bearing housing OD. Removing it I realised I could have roughed the ID to to ease the final operation at a later date. Set up the second one and bored it for the 8mm depth required, did the other then set the first up to do the same. Noticed on the drawing I had dimensioned this depth as 6mm so pencilled in the 8mm. It would be later in the evening dozing in front of the box and musing on the day that it hit me - the bearings were 8mm ID not 8mm thick. Not only had I not read my own drawings I'd operated on brain fade and amended the drawings to suit - Well bless my ****ing soul I thought - actually words far far worse
So, after turning some close fitting ring inserts back up goes the face plate, and the rings Loctited (638) in.
A quick mandrel was turned from a bit of scrap and held in the drill chuck to hold and keep the rings from twisting and the ring pressed home tight.
Gutted, and so sodding cross that such a mistake could be made on not one but all
three cases never the less the reclaim has worked well and should have no detrimental effect on the finished case. I'll put it down to an age thing - I'm certainly feeling it these days.
Back on stream the top was brought to finish on outer dimensions and the lower side waste roughed away leaving .5mm to finish. The case was then set up on a close fitting mandrel to bring the width to size and finish the lower face of the bearers true and parallel to the bore centre line.
And slowly, they are beginning to lose more weight
Final roughing op was to reduce the lower case ready for profiling
And this is current state of play with all of the major roughing completed
Next up is to make a couple of fixtures for holding on further ops - everything will slow right down now as it will be all too easy to remove areas that don't need to be but now the fun bit begins
Weather's looking good for next week so the garden may have some influence on shed time
That's it for now - Tug