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ADVICE please,still new to CNC router Weeke

4/5/15       
Joe  Member

Website: RodriguezCabinets.com

well our router is setup.
its a 4x8 480
C1 weeke,it uses 3 Becker pumps that are rated at 325 m3/H...

coupled with a belfab drawing about 5500 cfm for dust collection..

issue, while my parts for the first job we ran on it did not move at all, the start up vacuum is barely enough to let the machine start the program.
i am not familiar with alot of the terminology as far as vacuum units go,but the gauge on the side of my machine has to read past(on the left counterclockwise)-.45 BAR,-6.5 PSI.
i have been plagued with what i consider LDF which at some point my suppliers switched to rather than MDF as i have been sold.never really mattered till now i guess.
we work with mostly raw materials ,either mdf,particle board or plywood panels...
i guess the real question is ,is that minimum switch set about right or is it being over cautious?

things i have done to remedy the issue.
*hunted down some MDF , the reading is now some what more favorable, but as soon as i get a panel thats warped , i know it will not start the program.
*painted the edge of both the 5/8" LDF and the 3/4" MDF, it helped considerably.
*i tested both types of spoil sheets 49x97 by covering them with a 48x96 plastic sheet,got readings of -.7 BAR,-10 psi.

4/6/15       #2: ADVICE please,still new to CNC rout ...
Mike Hoffer  Member

Website: http://www.carolinaclosetsplus.com

Joe, we have a bhp200 (2007). i never had any luck using LDF. had the same problem with the hold down pressure. MDF or particle board core works fine for us. you got the right idea by painting the edges.

4/6/15       #3: ADVICE please,still new to CNC rout ...
Joe  Member

Website: RodriguezCabinets.com

thanks for the response.
wow, i would think particle board would just loose suction immediately.ill give that a shot.have plenty of it around, do you prefer 5/8 or 3/4"?

4/6/15       #4: ADVICE please,still new to CNC rout ...
Mike Hoffer  Member

Website: http://www.carolinaclosetsplus.com

we only use 3/4"

4/6/15       #5: ADVICE please,still new to CNC rout ...
yaakov

if i understand well yours mining "raw materyal" you mean mdf that not coat any side
in that case you have problem to rich the optimal pressure
paint /aplly edge to spoilboard will give you max bater effect of 0.3-0.5 not more
if you only cut the mdf (not less then 300-400mm) so maybi its ok that pressure
BUT if you also want pocket dont try

our recomend to our client is to work with mdf that coat with melamine that also save for them paint

4/6/15       #6: ADVICE please,still new to CNC rout ...
Joe  Member

Website: RodriguezCabinets.com

coated materials in the industry im in are not an option...wish they were ....cabinets are custom painted on site.

4/6/15       #7: ADVICE please,still new to CNC rout ...
yaakov

there type of MDF that coat with the primer
its also help alot and save alot of time for painting
its very hard and dangorus to mill raw MDF
in pocket forexample ,after you take the top layer of the MDF ,its almost nothing for vacuum ,and its can realse imeditly

4/6/15       #8: ADVICE please,still new to CNC rout ...
Michael Cassell

Please confirm you have fly cut both sides of the spoil board to remove the sealer as well as insuring it is flat, you must do one side and then flip panel and do the second side before you run anything

You may be restricting the flow of vacuum through the panel.

Also confirm you have the rubber gasket inserted into the grid around the table to increase the sealing as well.

4/6/15       #9: ADVICE please,still new to CNC rout ...
Joe  Member

Website: RodriguezCabinets.com

yes,i have fly cut the spoil board/s on both sides.
In my honest opinion, i think i have too much "flow through".
also, the gasket is in place , its sectioned into 3 grids that go to a manifold that has three pumps connected to it...
i have also checked for leaks around the gasket.when i didnt find one, i purposely moved one out of place a bit , it was pretty obvious then what a leak sounds like....

4/21/15       #10: ADVICE please,still new to CNC rout ...
GILAD

Hi i had same problem.
i found it helps to use high quality MDF
for spoil board.
I also use tape to seal the edges of the work piece and spoil board together.

4/22/15       #11: ADVICE please,still new to CNC rout ...
Mike McClaran

Website: http://www.greenbvc.com

Joe,
Here is a an article I wrote a few years ago.
Don't forget about a filler board. If you are doing a 5' piece you need to cover the last 3 feet with some kind of sealed material like 1/4" melamine.

http://www.woodworkingnetwork.com/custom-woodworking/wood-cutting-sha
ping/Five-Steps-to-Surfacing-a-CNC-Spoilboard-177128671.html#sthash.r1GxuIjx.dpbs


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