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Vic	19/09/2022 14:13:08
3453 forum posts 23 photos	I’ve seen reference online of “The ISO standard Pratt Burnerd 4" system” in reference to Chuck Backplates. Do any of you know what the specifications are for this, register and PCD?
Vic	19/09/2022 14:22:03
3453 forum posts 23 photos	I found this just in case it’s of use to others.
Michael Gilligan	19/09/2022 15:15:51
23121 forum posts 1360 photos	Posted by Vic on 19/09/2022 14:13:08: I’ve seen reference online of “The ISO standard Pratt Burnerd 4" system” in reference to Chuck Backplates. Do any of you know what the specifications are for this, register and PCD? . Strange that ISO would have standardised 4” MichaelG.
Vic	19/09/2022 15:59:57
3453 forum posts 23 photos	Agreed. PB no longer seem to sell a 4” chuck anymore either. Still, I have what I believe is the information I need so it just remains a curiosity as to where the information came from.
Michael Gilligan	19/09/2022 16:34:35
23121 forum posts 1360 photos	So I searched for your phrase, complete with the quote marks, and landed here: LINK https://www.beaufortink.co.uk/lathe-spindle-thread-look-up-table Nice diagram, but a questionable reference. MichaelG.
ega	19/09/2022 17:08:20
2805 forum posts 219 photos	MichaelG: Great find, especially for wealthy folk looking for triple start threading gear!
Vic	19/09/2022 20:28:18
3453 forum posts 23 photos	Posted by Michael Gilligan on 19/09/2022 16:34:35: So I searched for your phrase, complete with the quote marks, and landed here: LINK https://www.beaufortink.co.uk/lathe-spindle-thread-look-up-table Nice diagram, but a questionable reference. MichaelG. Thanks for that Michael. It doesn’t seem to match what I found in the PB reference.

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