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453 Bobtach pins and bushings
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<blockquote data-quote="Tazza" data-source="post: 12277" data-attributes="member: 82"><p>Ken - i have found the best source of information is being shown or told what to do. Reading books doesn't always get the info across as well. I had a GREAT machinist mate that would tell me what to do and then proceed to show me on his lathe. Small things that i never thought about but sooooo simple after being shown. Like machine new gland nuts for rams, just how do you measure the depth of the pressure seal groove? So simple, just work off the graduations on the cross slide and double it (double because you cut in 1mm you actually remove 2mm of material). Little things like that i didn't understand or at least think about at the time, so simple when told about it. Then you have the *art* of grinding your tooling correctly... i'm still working on that one...</p><p>You then need to understand tolerances, just how much should you leave for a press fit etc. Warping when you weld, crush from a press fit. Most of this i still don't understand but i do get by. My metal lathe is probably my most used piece of equipment. I have a mill, but i haven't had a chance to set it up and do any real work with it, i need more things for it like an indexing head, i have a few gears to make, great first job isn't it? i never seem start with something simple <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>Speed is something you will pick up later on, its best to take your time and get it rite.</p><p>One great thing i use on mine is thread cutting, its no where near as hard as many people may think.</p><p>Fishfiles - that was just an 5hp B&S powered rail drill i got at auction just for the engine, i needed to do some line boring and when i spoke to my machinist mate he said you need low seed and slow feed and i was like HELLO i know just what will do that. It was dirt cheap with a few other engines, its paid for its self with this one job. I'd like to throw an electric motor to it to make it quiet and lower vibration but its been used once in like 5 years. They use them with the yellow bit you see in the pic as a clamp to grab the rail way track. They then drill 1 1/4" holes through the track using the machine. It has some serious power, i was cutting about 1/8" with each pass with no problems, no chattering, hole was spot on.</p></blockquote><p></p>
[QUOTE="Tazza, post: 12277, member: 82"] Ken - i have found the best source of information is being shown or told what to do. Reading books doesn't always get the info across as well. I had a GREAT machinist mate that would tell me what to do and then proceed to show me on his lathe. Small things that i never thought about but sooooo simple after being shown. Like machine new gland nuts for rams, just how do you measure the depth of the pressure seal groove? So simple, just work off the graduations on the cross slide and double it (double because you cut in 1mm you actually remove 2mm of material). Little things like that i didn't understand or at least think about at the time, so simple when told about it. Then you have the *art* of grinding your tooling correctly... i'm still working on that one... You then need to understand tolerances, just how much should you leave for a press fit etc. Warping when you weld, crush from a press fit. Most of this i still don't understand but i do get by. My metal lathe is probably my most used piece of equipment. I have a mill, but i haven't had a chance to set it up and do any real work with it, i need more things for it like an indexing head, i have a few gears to make, great first job isn't it? i never seem start with something simple :) Speed is something you will pick up later on, its best to take your time and get it rite. One great thing i use on mine is thread cutting, its no where near as hard as many people may think. Fishfiles - that was just an 5hp B&S powered rail drill i got at auction just for the engine, i needed to do some line boring and when i spoke to my machinist mate he said you need low seed and slow feed and i was like HELLO i know just what will do that. It was dirt cheap with a few other engines, its paid for its self with this one job. I'd like to throw an electric motor to it to make it quiet and lower vibration but its been used once in like 5 years. They use them with the yellow bit you see in the pic as a clamp to grab the rail way track. They then drill 1 1/4” holes through the track using the machine. It has some serious power, i was cutting about 1/8” with each pass with no problems, no chattering, hole was spot on. [/QUOTE]
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