Hiwin bearings + rails set unused

Hi there I just listed an auction on ebay.
4 pcs of 600mm long HGR20C HIWIN rails
2 pcs of 1000mm long HGR20C HIWIN rails
12 pcs of HGH20CA HIWIN linear bearing blocks (6 bearings are still in original packaging) + some grease nipples, green plugs(2sizes) and linear bearing inserts
if somebody is interested and will buy through this advert (no fleeebay)I will deduct final sale value of £40 from sale price- fair for everybody. I meant to make cnc mill but due to circumstance never have time to get around it and I doubt I will- hence sale. Selling as set

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Hi there ,

Quite interesting deal...

Do you remember the preload value of these bearings ?

cheers.

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Originally Posted by iak65

Do you remember the preload value of these bearings ?

cheers.

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As far as I remember preload was ZA, but I don't have any invoice to confirm it. Maybe there is a way to tell preload from engraved code on bearing HGH20CA 0A084-3B??

ZO = Light Preload
ZA = Medium Preload
ZB = Heavy Preload

Quote:

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Originally Posted by AdCNC

ZO = Light Preload
ZA = Medium Preload
ZB = Heavy Preload

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That's exactly what I ordered- ZA Medium preload. It suppose to be used for rigid vertical CNC mill. Does the code on bearing confirms preload??

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Originally Posted by wiatroda

That's exactly what I ordered- ZA Medium preload. It suppose to be used for rigid vertical CNC mill. Does the code on bearing confirms preload??

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I am on the point of purchasing identical items so am interested, how can I get in touch to discuss and perhaps collect Dave

Hi again, here is what I found out.

To determine the preload of the HIWIN HGH20CA slide, just put the slide on the rail and hold the rail vertically. If the slide moves under its own weight the preload is Z0.
If not it is ZA. ZB is available for bigger slides only.
If you still have the packaging you can also find the preload value there (like on the picture) :
The C at the end is the precision value according to the HIWIN catalogue and determines the price of the slide.
ZA is good preload for a precise and stiff XY table on a CNC.
Are the items sold yet?

Cheers.
Attachment 5977

hi iak65
So it looks like they're ZA- they don't slide down by themselves
I still have them, but after unsuccessful attempt to sell them few times on fleebay I decided (rather got funds) to carry on with my cnc mill project as planned.
That's the screen capture how I plan the mill to looks like
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Basically structure is going to be 6mm steel plate milled to size + I plan to fill it up with epoxy granite for extra rigidity.