1. #1
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    Ok.... I received my Aluminium for my new cnc via UPS. 470mm X 300mm X25mm

    I clamped it down to the original bent Vacuum bed (which temporarily straightened it)... planned the new supported rail bearing block mounting holes in CamBam and successfully drilled and counter-bored the holes. First thing I have ever done with this machine since changing the Z axis plate and adding the 2.2kw Chinese spindle. What an improvement so far !
    Still a way to go to make it more sturdy, but I am already planning the next improvements to come.

    Now... in respect of holes for clamps on the cutting bed.....For now I am going to drill and tap some holes for clamps. (maybe cutting slots later if needed). What size metric holes should I use for the clamps ? M4/M6 ?? also I am I right in understanding I have to drill a M5 hole to use a M6 x 1mm tap ?
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  2. #2
    I wouldn't use anything less than M6, but you don't want them to be too big as the fasteners and clamps may get in the way, so either M6 or M8. You are correct in saying to tap M6 you need to drill a 5mm hole.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  3. #3
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    Great thanks Jonathon.

    I have drilled the holes 10mm deep. hope this is enough.

    I know when I used to build motorcycles 20 years ago, it was unadvisable to put stainless bolts into Alu unless you coated the threads in copperslip first, as over time the stainless would weld itself to the Alu. So I guess you all use mild steel bolts to mount the rail bearings to the table ?
    Last edited by dudz; 30-12-2012 at 04:58 PM.
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  4. #4
    Quote Originally Posted by dudz View Post
    Great thanks Jonathon.

    I have drilled the holes 10mm deep. hope this is enough.
    You'd be better drilling the thru holes then they don't fill with swarf or chips. If you can't do that then think about removable plugs or set screws.

  5. #5
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    good point jazz Thx. I might use set screws
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  6. #6
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    Click image for larger version. 

Name:	cnc1.jpg 
Views:	145 
Size:	114.6 KB 
ID:	7795Here is the finished Cutting bed. My first job on this machine. When i mount the new rails, I will skim the surface of this bed for trueness.
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

  7. #7
    dudz's Avatar
    Lives in Bretagne, France. Last Activity: 20-05-2017 Has been a member for 4-5 years. Has a total post count of 256. Received thanks 1 times, giving thanks to others 50 times.
    I still need to work on my drilling methods. When I used the counterbore endmills it seemed to cut with ease. When I drilled the holes with 5mm and 6mm HSS bits, it screamed like a "B$*ch" . Im not sure if I had the feedrates etc correct. Sounded like the Bits were blunt to me. / plunge rate 0 / Cutfeedrate 800 / Peck 2mm / spindle speed (I tried 8000 - 15000 ) / Target depth -11mm / tool dia 4mm and 6mm / used cutting fluid and air.
    Where do I put the input "400mm/min" for spiral down ?? can't find this in cambam for drilling (only for pockets and profiles), only cut feedrate in drilling .
    Last edited by dudz; 30-12-2012 at 09:35 PM.
    3 axis CNC/router / Alu profile frame....25mm Alu Cutting bed X=500mm Y=300mm Z=110mm.....Supported 25mm X rails ....Supported 20mm Y rails....Supported 20mm Z rails.....2.2kw Chinese WC spindle......"USB Breakout Board Interface 200KHz"....M542 Drivers..SY60STH86-3008BF Motors...running....Mach3 / Cambam / Emachineshop.

Similar Threads

  1. Clamping Jigs
    By Washout in forum Tool & Tooling Technology
    Replies: 4
    Last Post: 03-03-2014, 09:54 PM
  2. T-slot clamping accessories
    By Neale in forum Tool & Tooling Technology
    Replies: 2
    Last Post: 16-02-2014, 07:48 PM
  3. Clamping question
    By dudz in forum Metalwork Discussion
    Replies: 6
    Last Post: 26-01-2014, 09:56 PM
  4. Stepper shaft size and pulley bore size problem
    By psiron in forum Linear & Rotary Motion
    Replies: 13
    Last Post: 15-06-2010, 04:11 PM
  5. Some great DIY clamping setups
    By Yohudi in forum Computer Software
    Replies: 2
    Last Post: 22-01-2009, 06:54 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •