04-11-2021, 11:55 AM
In the post vintage years, new CWP's were manufactured by a variety of firms and some in-house. Pinions and crown wheels were inspected and those with matching tooth forms and characteristics were "matched" as pairs and then run together in a polishing/lapping operation, using a fine abrasive to finalise the tooth form and contact area. They were then assessed and if found to be quiet in operation, marked with the matching numbers and their setting distance, for use with the assembly gauges.
Apparently, vintage CWP sets were all made by ENV and are more reliable at random matching successfully.
So you should be able to see that selecting a random post-vintage crown wheel and a random pinion, possibly from different years and potentially different manufacturers is a lottery. I won't deny that sometimes, they can be carefully assembled, occasionally quietly, sometimes reliably but they should at least be run in a bath of mild abrasive to emulate the original lapping procedure before being carefully assembled with engineers blue to assess the mesh pattern, which is unlikely to be correct.
Of course, you can just "slam 'em together" and run them but we wouldn't do that these days, would we?
I personally, value my time higher than the several tens of hours required to do this properly, with a only small chance of success. If your time is free and you don't have any other call on it then go ahead but I'll be fitting one of the readily available, excellent quality replacements which can be installed and set up in a small fraction of the time. It's a small investment if you put a monetary value on your time......
Apparently, vintage CWP sets were all made by ENV and are more reliable at random matching successfully.
So you should be able to see that selecting a random post-vintage crown wheel and a random pinion, possibly from different years and potentially different manufacturers is a lottery. I won't deny that sometimes, they can be carefully assembled, occasionally quietly, sometimes reliably but they should at least be run in a bath of mild abrasive to emulate the original lapping procedure before being carefully assembled with engineers blue to assess the mesh pattern, which is unlikely to be correct.
Of course, you can just "slam 'em together" and run them but we wouldn't do that these days, would we?
I personally, value my time higher than the several tens of hours required to do this properly, with a only small chance of success. If your time is free and you don't have any other call on it then go ahead but I'll be fitting one of the readily available, excellent quality replacements which can be installed and set up in a small fraction of the time. It's a small investment if you put a monetary value on your time......