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Rifles, Reloading, Optics, Equipment
Gunsmithing
Cutting dovetails, how hard can it be...
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<blockquote data-quote="Trickymissfit" data-source="post: 634822" data-attributes="member: 25383"><p>you can't fix them long term. Many a person has tried in the past. Untill they find a way to stop the droop in the table, the gibs will suffer. There is a way to help it a bunch, but also creates another problem. The other isse with the gibs involves the narrow span of the saddle ways on the W axis. Plenty of way area, but to close together to counter act the leverage caused by the table over hang. I Mogliced one once thinking I had a solution to all the issues. The table was ground to less than .00025" compound error, and I used Moglice screw and nuts. Worked fantastic for about eight or ten inches of travel then locked up solid. Had to go back and seriously loosen everything up with regular ball screws. Machine ran great, and the compound error was less than half of the factory error. The other issue with Bridgeports that I never told any of you about is the lack of lube to the slides. Their system is prone to clogging up and also the oil lines will come out of their ports under any serious vibration. (they are only held in place by swedged lead pieces on the end of the oil lines. You can fix that with an afternoon of work, but then your faced with oil dripping all over the place. Why they never engineered an oil return system into the lube system I'll never know, and the wear on the gibs shows it after a few hundred hours of use. Moglice only needs about 1/4th the amount of lube to work well, but cannot handle missalignment caused by the table sag. Turcite would be far better, but in the end wouldn't last nearly as long as Moglice. Plus Moglice is what you want for accuracey. I'd rather use Rulon than Turcite, but it's also about ten times the cost. Yet it will last much longer than Turcite. I've rebuilt about 25 of them over the years, and had to learn about them the hard way. The factory rep told me once they were designed as throw away machines, and never ment to be rebuilt. I've built some pretty nice machines out of them, but nothing to compete with other milling machines of a different design.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 634822, member: 25383"] you can't fix them long term. Many a person has tried in the past. Untill they find a way to stop the droop in the table, the gibs will suffer. There is a way to help it a bunch, but also creates another problem. The other isse with the gibs involves the narrow span of the saddle ways on the W axis. Plenty of way area, but to close together to counter act the leverage caused by the table over hang. I Mogliced one once thinking I had a solution to all the issues. The table was ground to less than .00025" compound error, and I used Moglice screw and nuts. Worked fantastic for about eight or ten inches of travel then locked up solid. Had to go back and seriously loosen everything up with regular ball screws. Machine ran great, and the compound error was less than half of the factory error. The other issue with Bridgeports that I never told any of you about is the lack of lube to the slides. Their system is prone to clogging up and also the oil lines will come out of their ports under any serious vibration. (they are only held in place by swedged lead pieces on the end of the oil lines. You can fix that with an afternoon of work, but then your faced with oil dripping all over the place. Why they never engineered an oil return system into the lube system I'll never know, and the wear on the gibs shows it after a few hundred hours of use. Moglice only needs about 1/4th the amount of lube to work well, but cannot handle missalignment caused by the table sag. Turcite would be far better, but in the end wouldn't last nearly as long as Moglice. Plus Moglice is what you want for accuracey. I'd rather use Rulon than Turcite, but it's also about ten times the cost. Yet it will last much longer than Turcite. I've rebuilt about 25 of them over the years, and had to learn about them the hard way. The factory rep told me once they were designed as throw away machines, and never ment to be rebuilt. I've built some pretty nice machines out of them, but nothing to compete with other milling machines of a different design. gary [/QUOTE]
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Cutting dovetails, how hard can it be...
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