06-22-2019, 11:33 PM
(06-19-2019, 03:55 PM)tablesawtom Wrote: First of all I am a job shop Tool and die Maker with 50 years in the trade. I also taught Tool and Die for 10 years at Hawkeye Community College. I also have journeyman papers as a Mold Maker. I am retired but I do work 7:00 to 12:00 Monday Wednesday and Friday at Machine tool and Engineering in the next town over. And they let me use anything I want on my own time.
Yes I know that if it can be made once it can be made again. I know, I have been building dies, special machines, Jig And fixtures all my life. And to be able to make the spindles cost effectively with a production operator would take special tooling. Not one at a time from a toolroom Machinist.
Yes I know how to cut a left handed thread, You have to turn the tool upside down and run the lathe backwards. If one is cutting a right hand thread when on gets the the end of the thread they can back the tool out using the cross slide screw, no big deal. But to do it left handed one has to have the tool in position which is not easy and start the lathe with the half nut engaged and then advance the tool into the cut while every thing is running and all because of a 3 inch shoulder but the shaft size is around 5/8 inch. Not only that but there is a 1/8 machined shoulder that the blade sets on and the only extra room is the thickness of the flange. that the nut has to thread up against. Yes, I probably can make one but I am also smart enough not to.
And to be truthful every small surface grinder I have ever run has a left handed nut on the spindle except for the Brown and Sharp grinder we have at the shop which is right handed and the wheel doesn't loosen up even against the spindle rotation so the nut cold be right handed and if tightened down won't come loose. IF it is a right hand thread to do the job the tool goes in upside down and on the back side of the shaft and run ithe lathe backwards, one gets a right hand thread. Better yet find someone with a CNC lathe then the threading is done in a caned cycle and the Z is controlled numerically. then the shoulder is not a problem.
But you have to be able to start the thread and the safest way is to cut a groove which would weaken the part. Yes I can turn it down and sleeve it but there are threads on the end of the shaft that the major diameter are all but the same size as the shaft, If I cut down the shaft fare enough to recut the threads I will not have enough of the original shaft left.
I showed my problem to my working supervisor and the first words out of his mouth was If I still had my metal spraying equipment it would be a no brainer. We also discussed cutting a groove and putting in a split sleeve. Then he said he has been told to get a metal spraying equipment for the shop by the owner on a couple different occasions so I will wait and see how that comes out.
And now for the good stuff, it is not my saw arbor I am just trying to help out a friend. I was hoping someone might have an idea of where I can get on and I am thankful for the idea of possibly using a delta shaft. I will check that out.
The machine shop where I work part time is a CNC production shop and I am either going have to find a shop that does metal spraying or wait for the shop to get one if a Delta spindle won't work.
.I am wondering what the difference is between the left and right saws as far as the arbor goes. I thought the arbors were similar but the trunnions were different.
Also , would a 3hp saw arbor work or did they discontinue that as well. I recall reading somewhere the arbor replacement was about $20.00 when it was available.
mike
