Realising that accurate dimensioning of the two bevel gears would help with obtaining the correct gear mesh I set about devising a method to measure the gear teeth. I determined that the vertical bevel gear needs to be moved .013" away from the other centre. To achieve this I make a modified component - the oil spinner.
Measurement relies on the use of surface table and custom made gauge pins tapered to fit between the gear teeth. This technique seems to be successful. The real test will be when I reassemble the vertical head in the next video. Apart from the desire to better understand straight cut bevel gears, the reason for going to considerable effort to measure the gears was to obviate the need for tedious trial and error at the fitting stage. Assembly and disassembly of the head was far from straightforward.
I hope this video might contain some useful information for someone else who is working on a bevel gear drive - as part of the mill, or some other machine.
Comments on the measuring techniques would be much appreciated. There may be simpler methods for achieving the same result. I don't have access to gear tooth callipers which might have been useful.
00:00 Introduction
01:07 Gauge pin description
02:00 Using gauge pin to determine tooth addendum
04:50 Checking cone angle
06:29 Using gauge pin to locate axial position of gear cone
09:45 Checking housing centrelines
10:24 Checking tooth thickness using second gauge pin
13:50 Updated CAD drawing showing current gear mesh error
14:38 Options for correcting error
15:36 New spacer dimensions
16:10 Making new spacer
22:42 Comparing old and new spacers
23:13 Next video