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Treated myself to some new parallels!

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simplyloco:
I've been using this motley assortment for more years than I care to remember, so it was time for a rethink and a pocket money splurge!


I wanted a thin, thick and thicker set, in multiple heights, to deal with every possible setting situation, and ArcEurotrade have just the job!
Not cheap but worth every penny/cent!


https://www.arceurotrade.co.uk/Catalogue/Measurement/Parallels-Angle-Blocks-Test-Bars/Precision-Metric-Parallels-20-pairs-100mm-long-5mm-to-24mm

A7er:
I have never used a milling machine, so be gentle with a nidiot. The parallels sit in the machine vice, so one must assume, and hope, that the base of the vice is trammed (right word-ish?) to the spindle or cutter. Therefore, couldn't two pieces of metal bar be clamped in the vice and the edges machined as one, then turned over so that the machined edges sit on the vice, and then the opposite edges machined as one. Would that produce two identical parallels, or am I missing something? Blocks would have to be placed each side of the bars to keep the cutter from damaging the vice jaws.

tghs:
looks like a great set, that should be money well spent.. no more fiddling about for the correct support

crueby:

--- Quote from: A7er on May 16, 2023, 01:29:03 PM ---I have never used a milling machine, so be gentle with a nidiot. The parallels sit in the machine vice, so one must assume, and hope, that the base of the vice is trammed (right word-ish?) to the spindle or cutter. Therefore, couldn't two pieces of metal bar be clamped in the vice and the edges machined as one, then turned over so that the machined edges sit on the vice, and then the opposite edges machined as one. Would that produce two identical parallels, or am I missing something? Blocks would have to be placed each side of the bars to keep the cutter from damaging the vice jaws.

--- End quote ---
True, and the result will be as good as the precision of the machine it is done on. Nice things about the purchased ones is that they are ground to a much tighter tolerance than most of us can achieve on our machines, there are a lot of widths in the set, and they are hardened well and of an alloy that doesn't flex or twist. Trading off time for money, with precision thrown into the mix!

Hugh Currin:
Nice set!

Thanks.

A7er:

That would certainly work and produce an adequate set of parallels. The blocks on each side would have to be accurately machined parallel before use. In fact parallels would be prefect for this job. So, the cost of a cheap set of parallels would be well worth it, and likely more accurate than I could make. The only problem with a cheap set of parallels is that the cost to upgrade, to a nicer set of parallels, is a hard jump to make.


--- Quote from: A7er on May 16, 2023, 01:29:03 PM --- Blocks would have to be placed each side of the bars to keep the cutter from damaging the vice jaws.

--- End quote ---

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