DRO for dummies (aka .... me)

[DPittman]

Just would like to see 0.0005" as that's what I can measure ... So I guess I won't worry as much about 1/5micron.


Brad

Yes I'd go for the extreme resolution only if I could flip the extreme precision off for most cases and only on to see if I could impress myself.

 

[Bradells]

Yes I'd go for the extreme resolution only if I could flip the extreme precision off for most cases and only on to see if I could impress myself.

But then, knowing my luck, I'd end up with something that only shows 0.01 (had it happen before)

Brad

 

[DPittman]

But then, knowing my luck, I'd end up with something that only shows 0.01 (had it happen before)

Brad

Yes i don't know why they couldn't make it selectable resolution like on the old desktop calculators.

 

[Johnwa]

Yes i don't know why they couldn't make it selectable resolution like on the old desktop calculators.

A piece of black tape over the last digit or two works.

 

[Dabbler]

I own an indicator that reads in 2 micron increments; it is possible to accurately read to 1 micron with it. Probably useless for me, but I couldn't resist it

 

[Chicken lights]

I own an indicator that reads in 2 micron increments; it is possible to accurately read to 1 micron with it. Probably useless for me, but I couldn't resist it

Ok I’m curious enough to ask...

In layman’s terms- I can choose different fuel filters to use, a 7 micron, a 10 micron then a 25 micron for example

Now obviously there’s (apparently) a 3 micron difference between a 7 and a 10, how the heck do you measure something that small?? I’m guessing that’s just a tolerance built into the fabric used as a filter some engineer somewhere specced

But still, 3 micron difference!

 

[Dabbler]

filter medium is measured statistically by running a solution with sorted particles and measuring the percentage of pass through to whatever standard is being referenced.

measurements of thickness is done using a Marr indicator that uses the twist of a square shaft about double the thickness of a human hair to amplify the difference in height.

surfaces can be measured quire accurately for straightness using an optical flat, up to 1/10 lambda, which in the middle of the spectrum is less than 1/100 of a micron.

... and there are dozens of other distance measurement techniques. The current quickest way to measure accurately to about 1/5 of a micron cheaply is to use laser inferometry....

 

[Dabbler]

So in an incredible coincidence Tom Lipton (oxtool) showed off his tool room inferometer in Monday Night Meatloaf # 127 , starting at 32:00 into the video: