Pin vise bit number question.

[Rscott417]

I want to add details west knuckle coupler and bracket casting to a couple engines I'll be working on. It says to drill a .031" hole, what size drill bit is that?

[lajry]

1/32" is 0.03125

[BR60103]

The chart I have shows .031 as a 68 drill.

[doctorwayne]

A #68 bit is .031", but the 1/32" bit will work just fine, too.
If you really want to cover the spectrum of sizes, you'll need a set of fractional bits, numbered ones, lettered ones, and probably metric ones, too.

Wayne

[shortliner]

The chart I have shows .031 as a 68 drill.

Is there any chance of getting a copy of the chart, or one that shows conversion of drill-bit sizes for inches/millimetres/numbers? It would be a really useful thing to have. Please - pretty please!

[Rscott417]

Thank you for the info guys. Details west castings usually have the number of the bit you need to use, I thought it was odd they only had the size in inches for this casting.

[shortliner]

Cancel my previous request - an internet search has provided several - thanks anyway

For reference this is the one I will be using <!-- m --><a class="postlink" href="http://tubeamplifierparts.com/handy-amp-info/drill-bit-size-chart.html">http://tubeamplifierparts.com/handy-amp ... chart.html</a><!-- m --> - there is a large number of other choices

[BR60103]

Shortliner:
The chart I have came from (IIRC) an early issue of Model Railway Journal. The NMRA has it in their data sheets D1c. It's also shown on the little pack of drills that I have.

[shortliner]

Thanks, David