|
|
|
|
| Author |
|
|
Less brakes, more gas!
|
Dial Bore Gage Graduation and Range?
Been looking into gages...
is 0.0005 just fine or should I spend $ for a 0.0001? Difference is ~$150 on a 1.4"-6" range. What are the smallest and largest measurements one has to make with the bore gage on a rebuild? Thanks, -Michael
__________________
 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS Last edited by euro911sc; 11-17-2005 at 09:05 PM.. |
||
11-17-2005, 08:37 PM
|
|
|
I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
|
My set goes to .0005. you can estimate the next digit between the graduations so it is closer to .0002 or so. Remember the tolerances listed in spec books are given to the 0.01mm. Sometimes it only takes a few hundredths of a mm to be out of spec.
tolerance .0001" = 0.0025mm .0005" = 0.0127mm
__________________
Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
||
|
11-18-2005, 05:56 AM
|
|
|
Registered
Join Date: Feb 2004
Location: California
Posts: 926
|
If you are doing machine work, I would buy the .0001" resolution gauge. If you are checking used parts, or checking someone elses work the .0005" resolution gauge will be fine.
__________________
John Dougherty Dougherty Racing Cams |
||
|
11-18-2005, 08:13 AM
|
|
|
Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
|
The accuracy of the average user of a bore guage will vary much more than .0001".
Unless you are doing work for the DOD, .0005" is fine. I do question the need for a bore guage tho, it's just as accurate and cheaper to use an inside micrometer. Just make sure you check it with an OD mic that has been checked with a standard. It takes a little more finess but if you know what yer doing it will provide accuracy down to about .0002" (that's the limit I hold my employees to, but they are very good at it). |
||
|
11-18-2005, 11:15 AM
|
|
|
I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
|
Yes, setup is key. I have a cheap set of dial bore gauges. $40 on ebay. I use an outside mic to set the dial to "zero" on the required range. then double check a measurement with the mic set to the desired tolerance to make sure the dial gauge reads the same. My cheap set is surprisingly accurate if setup and used correctly.
__________________
Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
||
|
11-18-2005, 12:48 PM
|
|
|
abit off center
|
Yea, I think you would get 5 different readings from 5 different people.. try it sometime
__________________
______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
||
|
11-18-2005, 01:31 PM
|
|
|
Ugly Betty
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
