D.o.t.d.

[PWR RYD]

If you don't already have a dial or digital caliper, I suggest taking advantage of today's Deal Of The Day. I find myself using my dial calipers all the time. The unit on sale certainly isn't machinist grade quality/accuracy but it is hundreds of times more accurate than your eyeball and a tape measure :D

[mike s]

Re: D.o.t.d.

I think PE should also consider offering a 8" or 12" model for when working with the larger drivers.

[rone]

Re: D.o.t.d.

In every cheap digital caliper I have heard of/used, the power button only runs the display and the power drain is essentially constant. To avoid this one must remove the battery after use.

It would be nice to know if this one was different wrt power drain.

My harbor freight digital caliper was quite accurate when compared to a set of feeler gauges - and note that US pennies are IME 0.750 +/- 0.001 inches pretty reliably.

I prefer dial calipers due to the power drain issue.

[critofur]

Re: D.o.t.d.

Only 6" is often so frustrating - I wish it was at least 8". When working with larger woofers where 8" wouldn't be enough I find that I don't need the precision of a digital caliper, a steel ruler is fine in those cases...

EDIT: Well, not to say that a 10" or 12" digital caliper wouldn't be nice...

[critofur]

Re: D.o.t.d.

Perhaps we can modify these and make D.I.Y. longer calipers? That would be sweet...

[rone]

Re: D.o.t.d.

bump
corroboration:

http://www.fliptronics.com/tip0006.html

==========================================
All measurements are in microamps
Off On
Mitutoyo 500-171 2.0 4.0
Chinese Vendor 1 17.5 18.0
Chinese Vendor 2 17.5 18.5
Chinese Vendor 3 7.0 7.5
Chinese Vendor 4, #1 15.5 16.0
Chinese Vendor 4, #2 18.0 18.0
Chinese Vendor 4, #3 19.0 19.0
Chinese Vendor 4, #4 17.0 18.0
Chinese Vendor 4, #5 19.5 19.5
Chinese Vendor 4, #6 17.5 18.0
Chinese Vendor 4, #7 19.5 19.5
Chinese Vendor 4, #8 17.5 18.5
Chinese Vendor 4, #9 17.5 18.5
Chinese Vendor 4, #10 19.5 20.0
==========================================

All calipers, and one micrometer were all compared against a 1.00000 that was supplied with my 2" Mitutoyo micrometer. PN 167-141

Mitutoyo 293-761-30 1.00005
Mitutoyo 500-171 1.0000
Chinese Vendor 1 0.9995
Chinese Vendor 2 0.9990
Chinese Vendor 3 1.0010
Chinese Vendor 4, #1 0.9995
Chinese Vendor 4, #2 0.9995
Chinese Vendor 4, #3 0.9995
Chinese Vendor 4, #4 1.0000
Chinese Vendor 4, #5 0.9995
Chinese Vendor 4, #6 0.9995
Chinese Vendor 4, #7 0.9995
Chinese Vendor 4, #8 1.0000
Chinese Vendor 4, #9 1.0000
Chinese Vendor 4, #10 0.9995

All measurements were made 3 times, and were repeatable...