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General Chat (Vincent Related)
Jumping out of first gear.
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<blockquote data-quote="timetraveller" data-source="post: 10990" data-attributes="member: 456"><p>Also when Dick Sherwin lost a gear several years ago at a rally in Scotland and came all the way back down to the south coast without one gear it was found upon dismantling that the spacing of the gears along the shafts was incorrect. I forget which gear it was but it was clear from marks on the dogs that one of the gears had never been fully engaged since the bike was new. It was necessary to insert a shim in the correct place to push this gear in-wards before the dog engagement was correct. There is much to be said for having a jig which mimics the gearbox housing so that prior to assembly in the bike one can do a dry assembly in the jig and check that everything engages as it should. I looked into making one, or a batch, of these several years ago and got all the dimensions etc but never got round to making any. My own feeling is that it would be useful if each section had one to be used as and when needed by the local members. However, there are several of the professional machine builders in the club who have such jigs and it is possible that there is no demand for such devices among the general club members. It is more than just the mesh of the gears which has to be checked. I have found large discrepancies between some gears and some lay-shafts and it seems that at different times different dimensions were used for the splines. Given the wrong combination either the bits will not go together or they are so sloppy that they should never be used.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 10990, member: 456"] Also when Dick Sherwin lost a gear several years ago at a rally in Scotland and came all the way back down to the south coast without one gear it was found upon dismantling that the spacing of the gears along the shafts was incorrect. I forget which gear it was but it was clear from marks on the dogs that one of the gears had never been fully engaged since the bike was new. It was necessary to insert a shim in the correct place to push this gear in-wards before the dog engagement was correct. There is much to be said for having a jig which mimics the gearbox housing so that prior to assembly in the bike one can do a dry assembly in the jig and check that everything engages as it should. I looked into making one, or a batch, of these several years ago and got all the dimensions etc but never got round to making any. My own feeling is that it would be useful if each section had one to be used as and when needed by the local members. However, there are several of the professional machine builders in the club who have such jigs and it is possible that there is no demand for such devices among the general club members. It is more than just the mesh of the gears which has to be checked. I have found large discrepancies between some gears and some lay-shafts and it seems that at different times different dimensions were used for the splines. Given the wrong combination either the bits will not go together or they are so sloppy that they should never be used. [/QUOTE]
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General Chat (Vincent Related)
Jumping out of first gear.
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