mcload
Hot Rolled
- Joined
- Nov 5, 2007
- Location
- Houston, Texas
I thought I'd post a couple of videos I shot this morning of the gear train noise on my 9" Model B that has been upgraded to a Model A. Clearly, it was noisier at medium speed as opposed to slow (DUH). It bears mentioning that the gears are under only a slight amount of load, that being the QCGB and lead screw. It may sound different during an actual cut.
A couple things of note. I have yet to find a steel 20-tooth stud gear so I purchased a nylon one that I assume was printed. (It's the small white one)
It seems to work very well for the time being, and I'll bet it's much tougher than most of us think. For the cost of having a new gear actually made out of steel,
I could have a dozen of these gears ready to swap out; a new chuck, and a QC tool post set. So with any luck, a used one will become available somehow, somewhere.
I still have a bit of tweaking I can do I guess, but overall, I'm pleased.
Heck, the motor makes more noise that the gears. This little "American heritage" machine will probably never get put through heavy production work anyway.
Another issue I resolved was that the large "idler gear" was quite wobbly when I first started, and it made a ton of racket. I'll bet a lot of 9" have this same problem due
to wear. Even my Dad's 9" Model A has a wobbly idler gear. Clearly, the elegant solution would be to bore out the gear and press in a needle bearing, but that's much
easier said than done when you think about the process. Not hard, just time consuming....perhaps a winter project.
So what I was able to do is to insert some sleeves/bands that I cut out of stainless steel shim stock. Roughly speaking, it took a sleeve of .00015 to go between the gear
and the steel bushing, and another .003 sleeve to slip between the bushing and the square head bolt that holds it to the banjo arm. I works like an absolute charm;
no wobble at all and very free spinning.
In the "slow speed" video I disengage the gearbox and you can hear some ringing. I guess this is probably normal and the gears could use a heavier lubricant.
Like I said, still a bit of tweaking to do. All of the compound functions work great as expected. I have not messed with back gear yet as it needs oil and a spring for
the tensioner. Onward and upward through the fog. :-)
Thank you.
PMc
https://youtu.be/7PVLIx19UjU
https://youtu.be/Sgq_TSijjis
View attachment 330905 View attachment 330904 View attachment 330906
A couple things of note. I have yet to find a steel 20-tooth stud gear so I purchased a nylon one that I assume was printed. (It's the small white one)
It seems to work very well for the time being, and I'll bet it's much tougher than most of us think. For the cost of having a new gear actually made out of steel,
I could have a dozen of these gears ready to swap out; a new chuck, and a QC tool post set. So with any luck, a used one will become available somehow, somewhere.
I still have a bit of tweaking I can do I guess, but overall, I'm pleased.
Heck, the motor makes more noise that the gears. This little "American heritage" machine will probably never get put through heavy production work anyway.
Another issue I resolved was that the large "idler gear" was quite wobbly when I first started, and it made a ton of racket. I'll bet a lot of 9" have this same problem due
to wear. Even my Dad's 9" Model A has a wobbly idler gear. Clearly, the elegant solution would be to bore out the gear and press in a needle bearing, but that's much
easier said than done when you think about the process. Not hard, just time consuming....perhaps a winter project.
So what I was able to do is to insert some sleeves/bands that I cut out of stainless steel shim stock. Roughly speaking, it took a sleeve of .00015 to go between the gear
and the steel bushing, and another .003 sleeve to slip between the bushing and the square head bolt that holds it to the banjo arm. I works like an absolute charm;
no wobble at all and very free spinning.
In the "slow speed" video I disengage the gearbox and you can hear some ringing. I guess this is probably normal and the gears could use a heavier lubricant.
Like I said, still a bit of tweaking to do. All of the compound functions work great as expected. I have not messed with back gear yet as it needs oil and a spring for
the tensioner. Onward and upward through the fog. :-)
Thank you.
PMc
https://youtu.be/7PVLIx19UjU
https://youtu.be/Sgq_TSijjis
View attachment 330905 View attachment 330904 View attachment 330906