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Dunc
02-04-2009, 09:09 AM
Was in Lee Valley store (Canada) the other day and noticed this set of a 1-2-3 block and some anodized aluminum bars.
http://www.leevalley.com/wood/page.aspx?c=2&p=45089&cat=1,240,41064

There is only a single bar of each size. If I purchased 2 sets would the pair of, for eg, the 1/2-inch square ones act as a pair of parallels? Or, as I suspect, might I get - by random selection - one bar with the + tolerance and the other with the minus? Any way to determine?

Just a bad idea?

Circlip
02-04-2009, 09:18 AM
Did you ever check two pieces of ground HSS tool blanks from the SAME batch?? And tough as anodised Alumininininium may seem, it won't take a beating.

Regards Ian.

tony ennis
02-04-2009, 09:22 AM
Is 'Veritas' engraved into the face of those aluminum bar thingies? Just what you need - engraving on something that's supposed to be flat and smooth.

tony ennis
02-04-2009, 09:30 AM
These ChiCom parallels (http://www.use-enco.com/CGI/INSRIT?PMAKA=630-4257&PMPXNO=945646&PARTPG=INLMK3) are cheaper than the Veritas product and claim to be more accurate at +-.0008".

Each pair potentially being off by up to .0016 seems like a lot since these are set-up tools.

rowbare
02-04-2009, 01:11 PM
<snip>

Each pair potentially being off by up to .0016 seems like a lot since these are set-up tools.

Yes but these are meant to set up woodworking tools so I think the accuracy is quite adequate.

Timleech
02-04-2009, 01:16 PM
Did you ever check two pieces of ground HSS tool blanks from the SAME batch??
Regards Ian.

In my experience they're not always even flat, never mind parallel (or square, if 'square' toolbits)

Tim