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Farm Machinery
Workshop Projects
22mm dia hole and getting a correct distance on a mill?
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<blockquote data-quote="TheTallGuy" data-source="post: 6857059" data-attributes="member: 9121"><p>Making that depth of cut with long drills/mills & reamer is a bit of a chancey thing. The hole in the bottom piece is likely to be somewhat larger than in the top piece & you're going to have to have the head trammed in absolutely spot on in all planes or the holes will be at an angle & over that distance the offset will be appreciable. You would also need spacer blocks in near the holes to prevent deflection when applying cutting forces.</p><p></p><p>I think that my approach would be similar to [USER=11821]@tinman[/USER] above. I'd make a jig to hold two plates flat together for drilling & reaming then a second jig for assembly using guide rods in those holes to maintain alignment during assembly; if the centre spacer/web piece is being welded then some extra features on the jig/setup to assist clamping & warp control would be useful. Something else that will require a bit of consideration is how you are going to fit the bearings into the holes & at what stage.</p></blockquote><p></p>
[QUOTE="TheTallGuy, post: 6857059, member: 9121"] Making that depth of cut with long drills/mills & reamer is a bit of a chancey thing. The hole in the bottom piece is likely to be somewhat larger than in the top piece & you're going to have to have the head trammed in absolutely spot on in all planes or the holes will be at an angle & over that distance the offset will be appreciable. You would also need spacer blocks in near the holes to prevent deflection when applying cutting forces. I think that my approach would be similar to [USER=11821]@tinman[/USER] above. I'd make a jig to hold two plates flat together for drilling & reaming then a second jig for assembly using guide rods in those holes to maintain alignment during assembly; if the centre spacer/web piece is being welded then some extra features on the jig/setup to assist clamping & warp control would be useful. Something else that will require a bit of consideration is how you are going to fit the bearings into the holes & at what stage. [/QUOTE]
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22mm dia hole and getting a correct distance on a mill?
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