|
Post by andyhigham on Jul 1, 2020 10:50:36 GMT
By fitting a ratchet or roller clutch you are reducing the rotational speed of the pump. With a 30T ratchet wheel and 1 tooth movement the reduction would be 30:1. The same effect could be made using gear wheels or a worm wheel with no moving parts to fail
|
|
|
Post by Cro on Jul 1, 2020 12:22:33 GMT
I'd be happy to make some up but so swamped with fittings it wouldn't be any time soon. Maybe I should look into doing some CNC batches with Polly as I have laser cut tanks which slot together for soft soldering and the rest would be a doddle. I'll have a think on that one but by all means if you have a need contact me.
Adam
|
|
|
Post by coniston on Jul 1, 2020 14:45:45 GMT
The big benefit of the roller clutch over the ratchet wheel is the almost infinite adjustment that can be made to the throw. This is limited in ratchet tooth wheel to whole numbers of teeth, so 1 tooth being the smallest rotational movement per stroke. Ok if it is a wheel with a high number of teeth but most are less than 30 due to the small diameter. I have a couple of roller clutch lubricators and both work flawlessly. The clutches do wear in time but my first lasted well over 10 years use and a quick change for new ones got it back working perfectly.
Chris D
|
|
|
Post by andyhigham on Jul 1, 2020 19:15:08 GMT
I wouldn't mind betting the shaft wears out before the clutch. The shaft should really be hardened and ground
|
|
|
Post by runner42 on Jul 1, 2020 23:22:01 GMT
I assembled one of these recently and there are two things in the instructions which I did not get right at first: 1. shortening the bottom spring properly 2. I used the thicker spacer for more oil (7&1/4" gauge) and it means machining - " 0.5 mm off the top off the nipple 5-290-010 to stop the O rings clamping on the ram" The third thing I did (after a call to the supplier) was to polish the ram all over and also the operating arm on the cam It now works very smoothy and quite freely although I have not been able to test it under steam it has a good feel about it. Don't give up on it just yet. JM Hi Jim, I am particularly interested in the statement to machine 0.5 mm off the nipple as a consequence of fitting the thicker spacer. Much of the dialogue here and on the internet appears to require some adjustment to keep the overall measurement constant. In fitting the thicker spacer did the lubricator work OK prior to machining the nipple or did it lock up when the lubricator sleeve locking nut was done up fully? Brian
|
|
|
Post by Jock McFarlane on Jul 2, 2020 8:20:07 GMT
Hi Jim, I am particularly interested in the statement to machine 0.5 mm off the nipple as a consequence of fitting the thicker spacer. Much of the dialogue here and on the internet appears to require some adjustment to keep the overall measurement constant. In fitting the thicker spacer did the lubricator work OK prior to machining the nipple or did it lock up when the lubricator sleeve locking nut was done up fully? Brian Brian, The lubricator would not work freely then I machined the 0.5 mm off as per my note. That was what the instructions that came with the lubricator told me to do and I just followed that. You said that you would be able to get a copy of the instructions locally which comprises an exploded diagram and about 3 other pages. I can still PDF that to you if you like. Let us know how you get on. Regards Jock
|
|
|
Post by Jock McFarlane on Jul 2, 2020 8:24:50 GMT
I'd be happy to make some up but so swamped with fittings it wouldn't be any time soon. Maybe I should look into doing some CNC batches with Polly as I have laser cut tanks which slot together for soft soldering and the rest would be a doddle. I'll have a think on that one but by all means if you have a need contact me. Adam Adam, I am not in desparate need at the moment but when and if you do go ahead with a CNC batch I would certainly order a pair. Regards JM
|
|
|
Post by runner42 on Jul 4, 2020 5:56:20 GMT
I'd be happy to make some up but so swamped with fittings it wouldn't be any time soon. Maybe I should look into doing some CNC batches with Polly as I have laser cut tanks which slot together for soft soldering and the rest would be a doddle. I'll have a think on that one but by all means if you have a need contact me. Adam Adam, I am not in desparate need at the moment but when and if you do go ahead with a CNC batch I would certainly order a pair. Regards JM Hi Jock, the taking 0.5 mm off the nipple did the trick as you would expect. Thanks for the advice. Brian
|
|