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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Help with Studs
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<blockquote data-quote="steve cassel" data-source="post: 12281" data-attributes="member: 1447"><p><strong>Still Taps</strong></p><p></p><p>Howard, Thanks for the response. I was hoping someone 'in the know' would offer up the solution and tell me where I can buy the correct tap and die. </p><p></p><p>I did measure the thread pitch for both the (original Vincent) cylinder studs and the (reproduction) cases. Both the studs and the cases are 20 tpi according to my thread gauge. My very-near caliper tells me it is a 9/16 diameter. I'm guessing the hole is either a little undersize, or there is a difference in pressure angle... (55 degree? 60 degree?) Hard to imagine how the hole could have been tapped a little small... I'm guessing it's the PA. Either way, If I can find a tap that matches the original Vincent studs, it should chase the threads out quite nicely and I'll be back on track. I just need to know the proper tool and where to get one. And yes, you're right... I'll have to remember to get a 'plug' tap... Thanks. </p><p></p><p>Chris, Thanks for the heads-up on the oil pump problems. I haven't gotten that far yet, but I'll definitely check it. Seems like some of the cases fall into the list of "lumps which are suitable to make Vincent parts out of". </p><p></p><p>Regarding John W, I will have been waiting a year come November. I know there are people who have been on his list longer. I thought for a while that I might come and camp out on his doorstep myself... My daughter was looking at Maynooth College in Ireland, but chose to go to school in New York instead; so I guess I'll have to wait for another good excuse for a trip to Great Britain. Maybe I could convince my better half that we need a vacation...;-).</p></blockquote><p></p>
[QUOTE="steve cassel, post: 12281, member: 1447"] [b]Still Taps[/b] Howard, Thanks for the response. I was hoping someone 'in the know' would offer up the solution and tell me where I can buy the correct tap and die. I did measure the thread pitch for both the (original Vincent) cylinder studs and the (reproduction) cases. Both the studs and the cases are 20 tpi according to my thread gauge. My very-near caliper tells me it is a 9/16 diameter. I'm guessing the hole is either a little undersize, or there is a difference in pressure angle... (55 degree? 60 degree?) Hard to imagine how the hole could have been tapped a little small... I'm guessing it's the PA. Either way, If I can find a tap that matches the original Vincent studs, it should chase the threads out quite nicely and I'll be back on track. I just need to know the proper tool and where to get one. And yes, you're right... I'll have to remember to get a 'plug' tap... Thanks. Chris, Thanks for the heads-up on the oil pump problems. I haven't gotten that far yet, but I'll definitely check it. Seems like some of the cases fall into the list of "lumps which are suitable to make Vincent parts out of". Regarding John W, I will have been waiting a year come November. I know there are people who have been on his list longer. I thought for a while that I might come and camp out on his doorstep myself... My daughter was looking at Maynooth College in Ireland, but chose to go to school in New York instead; so I guess I'll have to wait for another good excuse for a trip to Great Britain. Maybe I could convince my better half that we need a vacation...;-). [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Help with Studs
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