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<blockquote data-quote="John Conroy" data-source="post: 24008" data-attributes="member: 56"><p>Greg dropped off the fork parts yesterday evening. The large bore need to be enlarge by only .012" and the bottom of it needed to be flat. The small bore needed to be opened up by about 1/4". Luckily Greg had a scrap fork tube to thread into the stanchions so they could be held accurately in the lathe chuck. The OD of the tube is 43 mm so too big to fit into the lathe spindle so I had to cut it to the minimum length that allowed that. I used a 3/8" boring ba with a dcmt carbide insert for both the boring and facing of the bottom of the bore. After chucking the part I had a hard time figuring out how to verify run out since I don't have a DTI with a stem 2.5 inches long. I had to make up an adapter so I could attach my old Starrett last word indicator as it is small enough to fit into the 1-1/16" bore. Both had less than .001" run out when in the chuck.</p><p></p><p>[ATTACH=full]8967[/ATTACH]</p><p></p><p>[ATTACH=full]8968[/ATTACH]</p><p></p><p>[ATTACH=full]8969[/ATTACH]</p><p></p><p>[ATTACH=full]8970[/ATTACH]</p><p></p><p>[ATTACH=full]8971[/ATTACH]</p><p></p><p>[ATTACH=full]8972[/ATTACH]</p><p></p><p>[ATTACH=full]8973[/ATTACH]</p><p></p><p>[ATTACH=full]8974[/ATTACH]</p><p></p><p>[ATTACH=full]8975[/ATTACH]</p><p></p><p>[ATTACH=full]8976[/ATTACH]</p></blockquote><p></p>
[QUOTE="John Conroy, post: 24008, member: 56"] Greg dropped off the fork parts yesterday evening. The large bore need to be enlarge by only .012" and the bottom of it needed to be flat. The small bore needed to be opened up by about 1/4". Luckily Greg had a scrap fork tube to thread into the stanchions so they could be held accurately in the lathe chuck. The OD of the tube is 43 mm so too big to fit into the lathe spindle so I had to cut it to the minimum length that allowed that. I used a 3/8" boring ba with a dcmt carbide insert for both the boring and facing of the bottom of the bore. After chucking the part I had a hard time figuring out how to verify run out since I don't have a DTI with a stem 2.5 inches long. I had to make up an adapter so I could attach my old Starrett last word indicator as it is small enough to fit into the 1-1/16" bore. Both had less than .001" run out when in the chuck. [ATTACH=full]8967[/ATTACH] [ATTACH=full]8968[/ATTACH] [ATTACH=full]8969[/ATTACH] [ATTACH=full]8970[/ATTACH] [ATTACH=full]8971[/ATTACH] [ATTACH=full]8972[/ATTACH] [ATTACH=full]8973[/ATTACH] [ATTACH=full]8974[/ATTACH] [ATTACH=full]8975[/ATTACH] [ATTACH=full]8976[/ATTACH] [/QUOTE]
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