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Help me edit a ppt slide on surface roughness
Offered as constructive criticism: A PowerPoint slide filled with words is not a good way to try to convey information to an audience. It doesn't matter how interested the audience is, or how much knowledge they have, a mass of words will transfer very little information to very few in the... -
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Two good mics and zeros
Did all the shops also send micrometers out to be checked, or were they regarded as personal tools that were the responsibility of the owner? As mentioned earlier by Jim Rozen, carefully checking a 1" micrometer against even the most accurately calibrated 1" standard doesn't say anything about... -
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Two good mics and zeros
That's not quite true. B&S has done the work of deciding what measurements should be made for a fairly comprehensive check of a micrometer, and having the B&S set makes doing so convenient. But, other than the optical flats for checking the anvils, anyone with a set of gauge blocks can make a... -
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Two good mics and zeros
That's why Brown & Sharpe makes (made?) the following micrometer calibration set. Most of the gauge blocks in my set are ±0 µ", with only a few at +1 µ", and the largest deviation from nominal is +2 µ". They're calibrated at 68 ℉ (20 ℃), and the coefficient of thermal expansion of the blocks... -
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Distortion of A2 air-hardening steel
Thanks for your comments. I've hardened and tempered the rubbing end of a smaller A-2 shaft before using a torch and IR thermometer, so am aware of the "right" way of doing it. In the present case, the tool only will be needed for a single use to remove a few thou. of material from soft steel... -
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Distortion of A2 air-hardening steel
If that is truly based on experience, it is quite useful. Thanks. I need to make an odd cutting tool, harden it, and then form it to final size with a tool post grinder. The closer I can make it to the final size prior to hardening, the less material I'll have to (slowly) remove with the... -
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Distortion of A2 air-hardening steel
Well, yes. As you say, the experiment has been done countless times, so someone knows the answer. My question is about a 1"-dia. rod that's 2" long. Irrespective of the lack of control, and while the warping very likely will be more than 0.000", it definitely will be less than 2". Under the... -
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Distortion of A2 air-hardening steel
$54 for a 1 ft. length of 1-1/4" from McMaster-Carr. There's no point wasting the time or money if someone already has done the experiment and knows the answer. That's why I asked the question. If no one here knows the answer, I'll have to do it myself, but hope springs eternal someone who... -
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Distortion of A2 air-hardening steel
Yes, I know. Still, my question assumes heating with a torch. -
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Distortion of A2 air-hardening steel
Thanks for the suggestion. Although the maximum speed of my welding positioner is only 5 rpm, it's much more appropriate for such use (abuse) than my lathe. Still, I would like to know how much warping, i.e. loss of straightness, to expect. -
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Distortion of A2 air-hardening steel
If I use an acetylene torch to heat a 2"-long rod of 1"-diameter A2 steel that is "perfectly" straight to begin with, to red hot and then allow it to cool, how much can I expect it to warp along its length? -
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Brown & Sharpe model 1020 or 1021 gauge amplifier.
For what it's worth, I have a 1025 amplifier. The problem it has is the OEM charger is capable of supplying too much current. The consequence of this is, if the batteries are low, the current draw from the charger will blow components on the circuit board. Although the OEM charger is fine to... -
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Where micrometer standards ever made in .500" increments?
Indicating micrometers are very useful but, although they have "micrometer" as part of their name, they are a different device than the micrometers the OP asked about. An indicating micrometer is zeroed on a standard and then deviations from that zero depend on the accuracy and linearity of the... -
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Where micrometer standards ever made in .500" increments?
The "zero" on an old, non-digital micrometer can be set anywhere using a gauge block, but how else are you going to set the zero on a digital micrometer without closing the micrometer? Also, unless someone's blood is at 68 oF (or whatever the shop temperature is at), thermal expansion of the... -
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Where micrometer standards ever made in .500" increments?
If it only is used at 4.500", a 4.500" standard would tell you if there was wear at that point. However, more generally, wear could occur elsewhere so your micrometer could be perfect at 4.000", 4.500" and 5.000", all of which would be at full turns of the thimble, but have a periodic error... -
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Weight specification for 5C collets?
I suppose that is meant as an insult, although I'll take it as a compliment. However, I've gotten as much useful input from this thread as I'm likely to get so thanks to everyone who responded. -
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Weight specification for 5C collets?
I'll be happy to tell you the swing, but first I'd love to know why that's relevant to my question. -
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Weight specification for 5C collets?
The length of the taper on my 7/8" (0.875") 5C collet is only 0.62", and even though the 7/8" bore continues for a total of 1.1", once it's past the taper there's nothing but the 1.25" OD of the collet body to support the weight (i.e. a gap between the 7/8" shaft and the ID of the collet... -
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Weight specification for 5C collets?
I only mentioned slipping to say ignore it. I only am asking about a maximum weight. I, too, don't remember ever seeing a maximum weight for a 5C, and I couldn't find any relevant information using google, but that doesn't mean there isn't a maximum weight. I'm hoping someone here has the... -
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Weight specification for 5C collets?
Imagine a 1"-thick flywheel on a 7/8"-dia. shaft that is inserted the full length of a 5C collet, with face of the flywheel itself sitting almost against the nose of the collet (so the weight is at an effective length of 1/2" from the nose). Is anyone aware of a specification for the maximum...