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Possible to account for gage runout?
The gage in this case is a 5C spin indexer, I'm using this to quantify the TIR of a sample of finished parts. The specimen holder is an internally tapered piece with a 1" OD which is held by the 1" 5C collet. The materialized TIR of the indexer, 5C collet and holder is 0.001", as measured with a... -
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Mitutoyo digital indicator error question
I've got a Mitutoyo 543-472B 0.5"-0", 0.0001" indicator that's acting up, it's a long shot but, figured I'd see if anyone here has encountered this. What happens is the least significant digit will blink "E" occasionally, and the 2nd digit will jump to a "1" even if the gage is measuring in the... -
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How to exit a dead end cut without moving the cross-slide?
I'm turning the end of a piece of finished round material to a reduced diameter. Once I reach the length of the reduced diameter feature, the work is done. The problem is how to get the cutter off the workpiece with out scarring it, and without moving the cross-slide, there are more than a few... -
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What is a tear-free surface?
I'm working on boring a hole to be finished with a roller burnishing tool. The operating instructions for the burnisher states: I've tried to find the answer to my subject question, have not found one to date. For context, I'm using a lathe and boring bar. Figured it wouldn't hurt to ask the... -
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Drill/tap end of leadscrew, how to approach?
I need to drill and tap one end of a leadscrew 5/16-18. The end already has a hole drilled, presumably for some sort of tailstock center used during it's manufacture. While I'm used to making such a hole with a countersink or spotting drill, this one has an odd looking profile, almost as if it... -
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Mitutyo 511-212 small bore dial gage help
I bought a used Mitutoyo small bore dial gage, sku 511-212, and have a couple questions I'm hoping someone here can help me answer. The sales catalog indicates this sku comes with one "spacer". The only thing I see missing on the specimen I bought is a washer that would be installed between the... -
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Finer bore finish needed
With a lathe: I'm taking about 0.0015" off the inside wall of an existing 0.260" hole in brass, depth is about 0.25", hole is open ended. I started with a Micro 100 boring bar from Grainger as shown in the picture. I'm going in slow with lube and doing a spring pass on the way back out, the... -
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QCTP repeatability expectations versus reality
Wondering if anyone has looked into how repeatable a QCTP is when the holder and cutter has not been changed, just the holder, with cutter, removed and replaced in the tool post? The reason I ask is I want to do a small run where I'll be finish turning the outside of a cylinder, then finish... -
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Gib replacement, what dimple profile?
I want to replace a gib in a lathe compound slide, material is brass. I have the gib blank, a basic 60 degree piece. The present gib is dimpled to use a dog point set screw. I'd like to replace the gib screws as well to get more projection for ease of adjustment. The most obvious approach is to... -
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ER collet question
I have a particular ER collet holder that allows in-spec tooling to slip inside the collet itself but, once the collet is installed in the collet nut, no-go. The tool in this case is a 1/4" carbide spotting drill bit I got from McMaster-Carr; the shank is true to spec as measured with a 0.0001... -
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Lathe DRO mounting question
I'm planning to install an optical scale DRO sensor to the cross-slide of a lathe, is there a rule of thumb when deciding whether to attach the scale (the long part), or the head (the short part) to the lathe's measured moving part, the cross-slide in this case? I'm inclined to mount the head... -
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Deburring the inside of a side hole approach, workable?
I'm going to turn and center bore a 1/2" diameter aluminum rod to 3/4" depth, inside diameter 3/8". The inside diameter needs to be a tight fit for a 3/8" insert. To finish, I need to drill a #22 radial side hole into what's now a tube. I've been having a hard time figuring out how to debur the... -
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Collet or chuck for tapered workpiece thoughts?
I want to hold a tapered workpiece in a collet or chuck, preferably a collet. The taper is very slight, less than one degree but, it's there. The piece must be held straight. Many of these will be processed, I don't want to mess with 4-jaw anything. I have one idea that has some potential, I... -
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ER-25 collet chuck, 2MT runout question
I installed an ER-25 collet chuck into a 2MT spindle, and chucked a 3/8" gage pin to check runout at the business end. The collet chuck claims 0.0002" concentricity. The spindle, on it's outside, measures about 0.0002" TIR. The gage pin, installed an a different ER-32 chuck also measures about... -
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TIR, hand turning or live?
Just about every TIR measurement I've seen, the device under test (DUT) is rotated by hand. I've been using an SPC interface device (which I acquired for nothing related to TIR), which places an SPC-capable indicator into TIR mode, TIR may then be measured with the machine running. As it was... -
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Straight rod for setting drill press table and cross-slide vise perpendicularity
Hello, first post, glad to be here! I want to ensure my drill press table and vise are perpendicular to the chuck, I've been looking for a rod that's known-straight which I can chuck, then gage off the table or vise base with a machinist square. I've tried using a drill bit but the flutes make...