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Taking things for granted!
NickG:
I occasionally use my grandad's old (can't remember if it's starrett or dathan) vernier when I get annoyed with the cheapo digi one. When you're making 2 bits that need a close fit you soon realise the digi one isn't accurate, also gives different readings between inside and outside dimensions. More recently started using the micrometer a bit more.
The slide vernier I have you definitely need a magnifying glass / jewellers loupe to see the graduations - there's one that's stayed in the box with it since my grandad passed it on. PITA to read. Maybe I should invest in a dial one just to do away with batteries! The display has been flashing on my digi one for months now presumably indicating I need new batteries so it might not even be reading properly.
Interesting about the M&W depth gauge Ade as I've always thought of M&W as a really good make - that's what my micrometer is.
Out of interest does everybody have proper depth gauges and are they worth getting? I've just got a sliding one with graduations down to 1/64" I think.
Nick
cidrontmg:
Hi Nick, "the digi one isn't accurate, also gives different readings between inside and outside dimensions."
well, that probably is true, you really can´t expect super precision from a 15 € thingy. But if there is largish discrepancy between the out- and inside measure results, the digivern might be in need of some adjustment. There are two screws recessed in the thing, that act on a gib strip, and they can and should be adjusted for minimal play. There are similar adjustments in practically every type of +/- serious verniers. In the photo, there´s a clock vernier below, where you can see them easily, but they´re much in the same place in the digivern, although barely discernible.
With a small screwdriver, give those screws some TLC, and see if there´s any improvement (I´d be willing to bet on some slack there). Thing is, the gibs in digiverns seem to be made of some very rapidly wearing material (as compared to analog "steam" or clock verniers), and they are in constant need of adjusting. Since I got the clock vernier years ago, after an initial adjust, it´s been immaculate ever since. I have three digiverns, and I´ve adjusted each of them many, many times in the same time.
:wave:
P.S. If there´s a difference when you measure the same thing well inside the vernier jaws, and near the points, that´s also a sure sign they´re in need of a small screwdriver. You can get the two readings to show the same last digit, so maybe you should :dremel:
Lew_Merrick_PE:
1) Cheaply made tools are rarely (if ever) calibrated. Resolution and accuracy are rarely in sync. If you don't take a set of gage blocks screwdrivers to the store with you (or have the right to return mail order stuff), you are asking for surprises in today's world!
2) I worked on the Apollo program during its latter days. Hand-held calculators had come out and most people were dumping their 24 inch long, 3-decimal place slide rules. I picked one up. It lives in a felt-lined glass fronted box (still in storage, unfortunately) with a brass hammer chained to it and an, "In case of emergency, break glass." sign I "borrowed" from a fire hose box that was being surplussed...
AdeV:
Looks like I owe Messrs Moore and Wright an apology.... having bumbled around with various measuring sticks, it looks like it's the Mitotoyo calipers that are unable to read depths correctly, even though readings between jaws are OK. Then again, it's all around the 0.005" variation on a 27mm depth, even a gnat's cock would look big compared to that. So, last time & used the M&W, I must have been doing something wrong...
NickG:
Cheers Olli, didn't have a clue they were there those screws. Will have to have a fiddle!
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