Thanks very much for the helpful information.
using your numbers...
1.200" x .2617 = .314.............. .314 x 150 rpm = 47 fpm
if your rpm is wrong re-figure accordingly....
That's actually very close. I haven't measured the pulley assembly, but I'd estimate the 1.2" SS shaft turns at about 120 rpm.
From Marks mechanical engineers hand book 4th edition....
under 600 fpm ( .001 x diameter in inches) + .001.......I have done this with squirrel cage fans at 700 rpm ...
..depending on your application .0015 per inch..
over 600 fpm (.002 x diameter in inches) + .002.
Thanks for that. That's exactly some of the info I was looking for. I do notice that the new stuffing box has a minor i.d. diameter of 1.204". That's why I assumed the new gland follower should be made with the same clearance?
If cutting a groove in the bushing for grease stay way from the ends of the bushing ...
.If application is horizontal ...Groove goes in the 12 o clock position...
if vertical put a circular groove in the middle.....
Is there anything that prevents an upgrade from packing to a lip seal?....or seals?
A tacky grease goes along way with bronze bearings...
Perhaps it should be made of bronze. The other end of the shaft rides inside a SS bushing, so I assume the gland follower could be made of SS? The current gland follower stuffing box is made of cast. Since I can't easily manufacture a gland from cast, I thought I'd use 18/8. It really doesn't come in contact with the tank water, except for a possible weep through the cord packing, but it is outside, so thought it would be an upgrade to go with SS?
I'm not married to the idea though. I've ordered enough SS to make the parts, but I could use something else. I'm thinking I need to be able to weld it, or press fit. I'd rather not try to machine the gland in one piece. I don't have the CNC equipment for that.
What kind of equipment?
more information and pictures usually get you better results...
Here's some more info.
The stuffing box and gland is off a 400 gal. ag sprayer. The sprayer has wheels and pulled behind a tractor. Runs off PTO. The sprayer is over 50 years old, but has been completely rebuilt with all SS parts. Tank, fittings, etc. all SS. The pump and frame are about the only thing original. I rebuilt the pump a few years ago. This gland and stuffing box are one of the few original things left, but it has lasted 50 years, so thought the design OK for my needs. I certainly won't live another 50 years.
I was able to purchase a new (old stock) stuffing box, but there is no new gland available. I was able to purchase a used worn one. I had originally planned to bore and bush the worn one, as a a replacement part, when I am ready to disassemble the sprayer and drop the replacement parts in place. Then when I saw the grease grooves would prevent bushing the gland, I thought the easiest was to make a new gland.
I have a manual Bridgeport mill, but no lathe. I have a Criterion boring head, with internal and external boring bars (with carbide inserts). I also have a Hardinge dividing head with a dead center I've used in conjunction with the mill, to turn parts. I think I can make the part, but maybe not.
Here are some more pics:
This is the a pic of the new (old stock) stuffing box and gland. The stuffing box doesn't have a lantern ring. It's just a simple one packed with graphite cord. The stuffing box screws into a SS 2" female couple. The SS couple is welded on the tank.
Here is a pic of the other side.
Here is the stuffing box and gland disassembled.
Here is a "stick man" drawing to give an idea of the layout of the tank and part in question.
As I mentioned the 1.2" shaft rides inside a SS bearing/bushing on one end and rides inside the cast iron stuffing box and gland on the other.