2020 POTD Thread Archive

needed a new suspension seatpost for my road bike and found a near new one on eBay, but without the seat clamps. Moved the clamps from the old post to the new one, then made some clamps for the old post.

Broke 2 trepanning tools doing the ID of this part. Think I ended up on a robust grind
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old (factory) ones at the top, new ones at the bottom
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anodised black. Got a bit of burning (the dark brown parts) due to the acid bath being a bit too hot. I think it needs to be kept under 75F to work well, ideally 70F (hard in a garage that's typically at 90F)
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On the post
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Finally got around to stamping the numbers on the new cross feed dial for the Logan. I built a tool first to locate the stamp in the correct
position: a pocket was bored such that the depth determined where the stamp landed.

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I don't own a mill, so the slot was carefully cut on my cold saw. I wound up slightly wide with it, but a .012" feeler gage between the tool and the
number stamp made up the difference.

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Finished numbers came out pretty well.
This part will replace the handle on the lathe: all that's left for this part is to make one and press into a hole drilled in the rim.

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I had Friday to make the basic skew chisel in carbide form for my wood lathe. I used over-priced 3/8" square bar from the big box store, cut off a small end, and welded it on (I am not a professional welder, obviously).

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I took it to the mini mill, and leveled the weld back down for a good seat with the carbide insert as well as the bottom side so it doesn't catch on tool rests. I'm using a 30mmx12mmx1.5mm planer blade for this insert, as I don't see any "carbide skew chisels" on the market.

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Drilled and tapped (and broken tap in the last hole so deep I had to offset the holes and drill and tap them again).

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Beveled the end. I still need to make the handle for it, but it finishes my trifecta of home made carbide wood lathe tools.

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It's not quite a skew chisel, as they had an acute angle on one end, but it's close enough for me.
 
Project today was making a receiver holder for some projects I have coming up. The part is to simulate the bolt on a AR style rifle so one can work on the lower receiver and index in any position needed. It also helps when torquing down the barrel nut to the lower receiver. It applies the torque to the correct area of the receiver instead of the receiver clamp blocks typically sold. First task was grinding a form tool To cut out the splines for engagement. Then making a tool holder to hold the tool.
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After putting the material on the lathe And getting to final dimensions of 1”od and .740 on the smaller od. I mounted The material in a spindex and setup for cutting the spline. Had to cut splines ever 4.5 degrees X 8 splines. Took several passes of cutter getting a final dimension of .531 on the inner OD.
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Once splines we’re cut I pulled out a collet block and cut a hex pattern on the opposite end for mounting into a vise. I then heated the spline area to a glowing red and submerged in oil for a heat treat.
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Once everything was machined I degreased and coated the material with a coat of Casey’s super blue. All and all it turned out pretty good and she fits like a glove. Thanks for looking.
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