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<blockquote data-quote="Trickymissfit" data-source="post: 632126" data-attributes="member: 25383"><p>I've done a few presses like that, and it's not as easy as it sounds. You can't do it all that well in a Bridgeport mill, but still can be done. I did my first two in a P&W jig bore, and did another pair on a SIP. You can also do it on a face plate in a lathe if the lathe is big enough. Shrink fit the bushings, and then recut them (I used Ampco Bronze drill bushings for a .0025" shrink fit. The ram will often show some wear and even taper, and you must fix that before making any finish cuts. I ground my rams .010" undersize, and then hard chromed them with about .015" of plating. Then ground the rams strait. Then recut the bushings to leave about .0015" stock in them. Then honed them for about .001" slip fit. I did do one with hard steel bushings (inner races for needle bearings), and I see it in use regualrly. You could always hard chrome the ram, and then bored the frame to fit. None are as easy as they sound.</p><p>What causes the bore to wear out of round is that the links between the ram and the lever work in a radius while the ram is trying to move in a strait line. There is a way to fix this problem, but have never went ahead and tried it. I did try epoxying bushings in the frame on one, but they didn't stay put under heavy pressure. The Ampco bushings are by far the better of the lot in my book.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 632126, member: 25383"] I've done a few presses like that, and it's not as easy as it sounds. You can't do it all that well in a Bridgeport mill, but still can be done. I did my first two in a P&W jig bore, and did another pair on a SIP. You can also do it on a face plate in a lathe if the lathe is big enough. Shrink fit the bushings, and then recut them (I used Ampco Bronze drill bushings for a .0025" shrink fit. The ram will often show some wear and even taper, and you must fix that before making any finish cuts. I ground my rams .010" undersize, and then hard chromed them with about .015" of plating. Then ground the rams strait. Then recut the bushings to leave about .0015" stock in them. Then honed them for about .001" slip fit. I did do one with hard steel bushings (inner races for needle bearings), and I see it in use regualrly. You could always hard chrome the ram, and then bored the frame to fit. None are as easy as they sound. What causes the bore to wear out of round is that the links between the ram and the lever work in a radius while the ram is trying to move in a strait line. There is a way to fix this problem, but have never went ahead and tried it. I did try epoxying bushings in the frame on one, but they didn't stay put under heavy pressure. The Ampco bushings are by far the better of the lot in my book. gary [/QUOTE]
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