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IndustryArena Forum > WoodWorking Machines > Commercial CNC Wood Routers > Biesse > biesse rover b 4.4 vacuum problems
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  1. #1
    Join Date
    Aug 2011
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    0

    biesse rover b 4.4 vacuum problems

    my biesse rover b 4.4 is pulling -.4 vacuum. i have alot of parts slipping and was wondering if it should be running more than what it is. im going to look into changing the way the parts are layed out also, we are using a .375 compression bit and there is around .5 material left between parts and on the outside of parts after the cuts have been made which is creating chatter. im going to move the parts closer together so that should help with the chatter. but i cant think of anything else to help with the slipping problem.

  2. #2
    Join Date
    Nov 2007
    Posts
    2466
    look at make and model number, specs of the vac unit for capacity. then leaks , gaskets, pods, lines etc. then tool path strategy (small parts first, etc)

    use of onion skin tool path stategy etc
    James McGrew CAMaster 508 ATC
    www.mcgrewwoodwork.com http://dropc.am/p/EJaKyl

  3. #3
    Join Date
    Mar 2003
    Posts
    35538
    Is this through an MDF spoilboard? Are you cutting full sheets, or individual parts.

    On our Morbidelli, I can cut with the vacuum as low as .180, if I'm using full sheets. Anything smaller than 300 sq inches get's onion skinned.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  4. #4
    Join Date
    Aug 2011
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    0
    yes we use a spoilboard, its a 4x10 on a 12ft table so a normal 4x8 sheet has 2ft of spoilboard left and the last 2ft of the table has plugs in it so we don't loose suction there. we put full 4x8 sheets on the cnc and cut multiple parts out of them. for example: sheet one might have a cabinet back and some sides and some toe kicks (the toe kicks will slip), sheet two will be inside dividers, bottom, and top bracing (bracing will slip). the spoilboard is just laying on the table i dont know it it needs to have silicone or tape around it, there is a gasket under the spoilboard on the table. we use a .375 compression bit to cut everything from 3/4 two side mica to 1/2 plywood which i think should be a .5 bit for prelam and .5 down spiral for plywood. my feeds are 70% - 80% which i also think is to slow. we are tabing or bridging the small parts and either the tabs will get broken or the part will move enough to get chatter. one of the programs we use is sigmanest.
    we had a northwood at the cabinet shop i ran before moving to where im at and it was a workhorse. we cut 1" ply at 100% - 120% feed rates at the fastest that cnc would move, somewhere between 400-600 in per minute and never had this many slips. we also used silicone on the outside of the spoilboard to help seal any leaks.
    thanks for the replys.

  5. #5
    Join Date
    Mar 2003
    Posts
    35538
    How big is your pump? We have two 25HP pumps on a 5x12 table. We mostly cut 4x8 sheets, so a lot of the spoilboard is uncovered.

    I can cut 4"x12" toe kicks without movement.

    What we do is cut all smaller parts on the sheet first, leaving a .008" onion skin.
    Then go back and remove the onion skin first, then cut the remaining (larger) parts last.

    We only cut .003" into the spoilboard. If the spoilboard has a lot of grooves in it, smaller parts WILL move. By cutting .003, we can usually cut 50 sheets between surfacing the spoilboard. We take .01" off each time we surface it.

    For the cheaper plywood we use, I leave a thicker onion skin, around .1", but use the same technique as above.

    I typically use 1/2" compression bits, 16,000 rpm and 800ipm, with the machine set at 120%.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  6. #6
    Join Date
    Mar 2003
    Posts
    35538
    Our spoilboard just lays on the table also, with a rubber gasket around the perimeter.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  7. #7
    Join Date
    Aug 2011
    Posts
    0
    we use sigma nest and cadco to do the nesting. i would like to use sigma nest exclusively but i havent gotten to that point yet. i dont know how much control these programs give the programmer.

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