The process you see is lapping out the valve casing ID (inside diameter) on the lathe using a steel mandrel that has been parrallel machined to size and with the addition of abrasive paste compound the inner walls of the casing are made cylindrical again.
@mitpicvid Yes thank you. I looked it up on the Votaw tool site. It's a plain sleeve, right? Does this one expand like the hand operated one Votaw has? And how are the pistons themselves lapped? On a lathe?
No it won't expand as it's machined round stock, to a specefic OD. For lapping valves in the lathe you would use the abrasive compound with a lapping block & the valve is rotating in backgear. Check lapping block - Ferrees Tools cataloge!
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I'm thinking about buying a second hand trumpet, but it has scratches on the valves 1 2 and 3 What do you think?
pecas20101 1 week ago
It just kind of looks like a reamer. Is there any difference between this tool and a reamer?
Lengsel7 1 year ago
Hi @Lengsel7.
The process you see is lapping out the valve casing ID (inside diameter) on the lathe using a steel mandrel that has been parrallel machined to size and with the addition of abrasive paste compound the inner walls of the casing are made cylindrical again.
mitpicvid 1 year ago
@mitpicvid Yes thank you. I looked it up on the Votaw tool site. It's a plain sleeve, right? Does this one expand like the hand operated one Votaw has? And how are the pistons themselves lapped? On a lathe?
Lengsel7 1 year ago
@Lengsel7
No it won't expand as it's machined round stock, to a specefic OD. For lapping valves in the lathe you would use the abrasive compound with a lapping block & the valve is rotating in backgear. Check lapping block - Ferrees Tools cataloge!
mitpicvid 1 year ago
@mitpicvid Thanks.
Lengsel7 1 year ago