Spindle nut pattern and size specifications

Spindles and ATCs PwnCNC Spindle System
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Hi All. I have looked through the knowledgebase and searched in the forum. I cannot find any specification data for the collet nut on the 80mm 2.2kw spindle. I want to buy a torque wrench for the nut on the spindle. There are several types of nut and I would like to know what type of nut is fitted to the 2.2kw 80mm air cooled spindle. I have illustrated several patterns of nut wrench below. Any assistance would be very welcome.

Torque wrench patterns

I have looked at many different ER collet sets and where the vendor has been able to talk about the country of manufacture, I have been surprised to find many are from generic manufacturers in countries which are not known for their QA systems.

I had finally settled on an Omega ER 20 collet set and was suprised to find that they were made in India by a generic manufacturer. At a cost of £176.70 ($220) per set (plus 20% VAT) from 2 ~ 13mm, I thought I would want to be able ensure the manufacturer’s quality, which is hard to do when they are not available for handling.

Several names presented themselves: Schaublin (the original inventor of the E collet), Techniks whose products are very expensive and Rego-Fix, who modified the original E collet of Schaublin and the modified collet has become the ER collets we know so well today.

I decided to buy a set of REGO-FIX collets. Standard collets have a TIR of 10 microns (0.00039") and the Ultra Precision collets have a TIR of 5 microns (0.00019"). They cost £19 ($23.66) and £29 ($36.11) respectively plus 20% VAT. Not as cheap as they could be but they are made in Switzerland so the quality is assured.

Rego-Fix Torque Wrenches

Thank you.

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If you’re looking for the shape, the Spindle wrench listing has pictures, which looks like picture 3 from your link

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Thank you… this was the exact information I was looking for.

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I forgot to ask… is the spindle thread M25 x 1.5. TIA

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I don’t have confirmation of that information at this time, but looking at several listing on Google that’s what they were. We’re not trying to reinvent the wheel

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Thank you. Perhaps I can find out from your spindle supplier?

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I found this image among your info sheets. It appears to show the spindle diameter as 23mm.

https://support.pwncnc.com/kb/article/136-2-2kw-80mm-er20-air/

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Then it sounds right. Threads are measured by the OD

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Great! That helps me plan several purchases before my PwnCNC spindle package arrives. Thanks Chris.

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Could you please tell me what the collet nut extrernal dimensions are. I have seen that they can vary and the dimension across the flats can be anywhere from 28 to 35mm. I need to know so that I can buy the appropriate detachable spanner head for a torque wrench. Thank you.

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The flat sizes were available on the spindle wrench listing i shared before in the description

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Thanks Chris… just old age setting in I guess. The excitement is mounting as the day of the Spindle/VFD draws near. :wink:

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