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Lab talk, the good, the bad, and the ugly
Metal
Milled Bridges Rocking Again
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<blockquote data-quote="kimba" data-source="post: 219912" data-attributes="member: 9600"><p>In my experience , all , or the vast majority of problems with rocking bridges is in the pattern before it is invested. Maybe the waxers are heating the pattern up too much when spruing? not taking as much care with milled patterns as they perceive they are more robust than handwaxed patterns? The cynic in me sometimes thinks that some metal workers will try to find problems in milled patterns because "there is no way a machine will do it better than them by hand" I do lower my expansion ratio for bridges , but I don't think this is your problem if hand wax is fitting and milled are not. Have you personally milled , sprued and cast to see the results? I had this problem with a metalworker who swore blind it was the investment, so I got a different investment for him. same problem . This went on until we did a challenge . Me wax 2 bridges , him wax 2 bridges mill 2 bridges. We each sprued and cast 3 . Guess what .. mine all fitted , his a mix. sorry for the long winded response , but I think its in the spruing for what its worth. Hope this helps</p></blockquote><p></p>
[QUOTE="kimba, post: 219912, member: 9600"] In my experience , all , or the vast majority of problems with rocking bridges is in the pattern before it is invested. Maybe the waxers are heating the pattern up too much when spruing? not taking as much care with milled patterns as they perceive they are more robust than handwaxed patterns? The cynic in me sometimes thinks that some metal workers will try to find problems in milled patterns because "there is no way a machine will do it better than them by hand" I do lower my expansion ratio for bridges , but I don't think this is your problem if hand wax is fitting and milled are not. Have you personally milled , sprued and cast to see the results? I had this problem with a metalworker who swore blind it was the investment, so I got a different investment for him. same problem . This went on until we did a challenge . Me wax 2 bridges , him wax 2 bridges mill 2 bridges. We each sprued and cast 3 . Guess what .. mine all fitted , his a mix. sorry for the long winded response , but I think its in the spruing for what its worth. Hope this helps [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Milled Bridges Rocking Again
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