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Old 11th October 2020, 07:36 AM
steamy1 steamy1 is offline
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Full Name: Mr Steamy One.
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How about, making the bung up with a centre drill dimple in it and gluing ( Araldite ETC) a ball in place.

I think that would be accurate enough.
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Old 11th October 2020, 03:12 PM
clayton21 clayton21 is offline
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Full Name: Andrew Silman
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Default Accuracy

Quote:
Originally Posted by steamy1 View Post
How about, making the bung up with a centre drill dimple in it and gluing ( Araldite ETC) a ball in place.

I think that would be accurate enough.
Yes I've been thinking about that especially with the links to Ball Bearing Manufacturers / Sales Outlets. The key is its accuracy as a small degree out at the base will quickly be exaggerated the further out you go (Yes I know there will be a phrase / definition name for this but, sorry, don't know it).

If, as replies suggest, this side of the 'Pond' we don't use a Tooling Ball here - how do you achieve the same ie centering above a cylinder (3" dia in my case) thats at 20 degree angle to the X Y axis - or do we just eyeball it?? (I guess eyeballing will likely be more accurate than a minimally misaligned ball bearing.....?)

Kind Regards,

Andrew
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Old 11th October 2020, 04:04 PM
Henry Maudslay Henry Maudslay is offline
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Careful marking out to find your centre,then pick up the centre with a centre in drill chuck or collet. Or the venerable "sticky-pin".
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Old 11th October 2020, 07:02 PM
steamy1 steamy1 is offline
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Now that I have had a rethink and watched the video right through I think Henry Maudslay's method above would work fine.

But note that you will probably still have to calculate the distance B, D, + the distance to your holes depending on your drawing information.

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