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Boyan Silyavski
08-06-2015, 10:43 AM
Have you seen that? Its some new contraption. What are your thoughts?

I have seen similar but actuated by air and bigger, have seen rollers. I wonder how to suck the chips so the bearing balls could roll. May be blow away constantly the dust. I see a possibility that this could be very useful if the dust is evacuated somehow.

http://www.aliexpress.com/item/Free-Shipping-80mm-Spindle-Holder-Clamp-Plate-For-DIY-CNC-Router-Material-Auto-Pressure-Plate/32265634856.html?spm=2114.32010308.4.11.lCkg65

http://www.mycncuk.com/attachment.php?attachmentid=15483&stc=1

Web Goblin
08-06-2015, 11:42 AM
Looks very similar to a very old design for keeping constant torch height for plasma cutting/marking thin plate when the machine did not have thc.

Boyan Silyavski
08-06-2015, 12:33 PM
Agree. I was thinking more of a usfull for engraving big sheets of thin material, where the material is fixed at extremities but no vacuum table

m_c
08-06-2015, 12:33 PM
I'm thinking it could probably have uses on thin material where a vacuum bed is not available.

Boyan Silyavski
08-06-2015, 12:37 PM
I'm thinking it could probably have uses on thin material where a vacuum bed is not available.

ha ha, thinking the same at the same moment

Lee Roberts
08-06-2015, 01:22 PM
Agree. I was thinking more of a usfull for engraving big sheets of thin material, where the material is fixed at extremities but no vacuum table

Exactly, I have more or less thought about the same thing/design in my head for working with thin wood sheets, 4, 6, 9mm ply and so on, this design isnt a bad one, for mine i considered bigger balls though and just LM type bearing units with round rail - manual adjustment.

.Me

Boyan Silyavski
08-06-2015, 01:57 PM
Exactly, I have more or less thought about the same thing/design in my head for working with thin wood sheets, 4, 6, 9mm ply and so on, this design isnt a bad one, for mine i considered bigger balls though and just LM type bearing units with round rail - manual adjustment.

.Me

The most useful i have seen till now are 2 gantry wide rollers that pneumatically actuate and roll in front and at back of spindle. A bit of overkill for home use though. Otherwise would have implemented them already in my OTT build :tan:

Lee Roberts
08-06-2015, 02:11 PM
The most useful i have seen till now are 2 gantry wide rollers that pneumatically actuate and roll in front and at back of spindle. A bit of overkill for home use though. Otherwise would have implemented them already in my OTT build :tan:
These are the units I was thinking about, didn't get as far as size just "head thoughts" to date but it's not complex design...

Edit: http://m.ebay.co.uk/itm/291159321989

.Me

Boyan Silyavski
08-06-2015, 02:14 PM
These are the units I was thinking about, didn't get as far as size just "head thoughts" to date but it's not complex design...

Edit: http://m.ebay.co.uk/itm/291159321989

.Me

if they are big enough and spring included somehow.


these were the ones in my mind :hysterical:


https://www.youtube.com/watch?v=pMohATXMvWc

Lee Roberts
08-06-2015, 02:25 PM
Well for spring I thought about just putting some on the linear rail that supports those units, adjust the spring as needed...job done

GEOFFREY
09-06-2015, 12:19 AM
I think a lot of commercial PCB machines use an air operatedn spring loaded "pressure foot", no balls, but a short brush dust shoe which also connects to a vac to remove chips,dust etc. My Wessel machine built in 1985 had this system, but I removed it when converting the machine as I like to see the cutter and work when cutting. Another disadvantage for me was that as I made miniatures, tiny components not tabbed in were likely to disappear into the vac bag!!! G.