. .
Page 16 of 28 FirstFirst ... 6141516171826 ... LastLast
  1. #151
    My rear plates are between 180-200 wide which I find is good balance between strength and space saving for a small machine. On larger machine I will try to make wide has possible to get most ridgidty. Carriage separation I make wide has possible and take the bearings to the edges of plates. Vertical Separation is roughly half the rails length.

    Regards the pockets then it depends on the material your using.? If your using Ground cast plate then no because it defeats the object of the plate being ground. If just rolled Plate then yes it needs to be machined because it's often not flat.
    If using Ground plate and you want registers for the bearings then Mill some Aluminium blocks or dowels into the plate inline with the edge but slightly overhanging the bearing side then secure with loctite.
    Then Machine away the overhanging part to give your reference edge but set cutting tool flush with ground surface so not cut away. In practice it's actually much quicker than buying rolled plate and machining away pockets and more accurate.
    Personally I tell people not to bother unless they are sure the whole machine is accurate from base upwards because they make adjustment much harder and in flexible.
    In an idle world then yes you'd have them but the reality is that building in your Man cave then in-accurecy is sure fire going to be there so any thing to help adjust error out is welcome.
    Also in DIY setting then it's unlikely you'll be chasing Um accurecy and neither will you be stripping it down every other week. So provided you take care when setting up and use good quality fasteners, tighten them up properly and use retainer then you'll not have any troubles and chasing away error will be so much easier.


    One potential Gotcha I spotted on your drawing. The holes in the Top and bottom plate which fasten them to the rear plate may interfear with the bolts on the Gantry bearings.? Easy done so check it.!
    Last edited by JAZZCNC; 22-11-2015 at 02:17 PM.

  2. #152
    Some progress. Am I going in the right direction? My only concern is I've had to mill a channel to allow the BF12 mount to not interfere with the plate holding the motor. Where the slot is the thickness of the plate is down to 10mm. However, its quite a narrow channel...

    Click image for larger version. 

Name:	z axis1.JPG 
Views:	315 
Size:	53.3 KB 
ID:	16588Click image for larger version. 

Name:	z axis2.JPG 
Views:	288 
Size:	42.4 KB 
ID:	16589Click image for larger version. 

Name:	z axis3.JPG 
Views:	290 
Size:	49.2 KB 
ID:	16590

  3. #153
    Split the difference by machining both sides like this.
    Click image for larger version. 

Name:	IMAG0873.jpg 
Views:	329 
Size:	190.1 KB 
ID:	16591

  4. #154
    I've been busy all this week so not had time to work on this. However, I've sneakily booked Monday off so I can get some more time on it! Instead of constantly asking questions, I've tried to think of all the main concerns I have at the moment. I would be very greatful if anyone can answer a few!


    1. I need to work out how I am going to attach the extrusion (bed) to the aluminium tooling plate. I think I have two options: a) Either drill the tooling plate and insert bolts from the underside which screw into t-nuts in the extrusion. b) Or use aluminium corner brackets on the inside of the extrusion?


    2. I think I need to assess how I am connecting the extruded pieces to eachother (for the bed frame). The X axis extrusion is actually comprised of a 45x45 piece and a 45x90 piece ontop of eachother. Unfortunately I cant seem to find a single 45x135 piece? At the moment they are only attached together by the steel end plates. Do I also need some internal corner brackets? I was also wondering if to add some plates bolted to the side of the 2 extrusion pieces?


    3. How should I re-inforce the steel end plates? Would it be a case of simply increasing the plate thickness from 5mm? The end plates don't hold the ballscrew bearing houses (these are attached to the extrusion). The plates at the back of the machine do, however, hold the stepper motors.


    4. Is it possible/recommended to add a vaccum to the z axis for swarf? Is this only to be used for wood? I am also going to add brackets for a coolant hose.


    5. I need to consider draining the coolant. Could this simply be a hole cut into the tooling plate with a pipe which goes through the table beneath into a bucket? My only concern is I don't have a "fall" for the water.




    Hopefully those all make sense!


    Thanks again,


    Dave

  5. #155
    #1 Drill the Plate and screw from under side.

    #2 Drill thru the upper extrusion and bolt into lower T-slots. Can add some Blocks into the slots to stop them sliding.

    #3 If just bracing then 5mm steel will be just about ok, But personally I'd use 9.5(3/8")mm Aluminium so don't have hassle of painting etc plus steel on ali is not good mix.

    #4 Can do it but it's difficult and not very effective unless high vacuum. Much better with Blown air and minimal Mist to clear/Lube chips.

    #5 Simple holes at one end and angle the machine on bench using feet.

  6. #156
    Hmm I may have to re-consider the steel then. The cost of getting all this aluminium machined is going to be a bit eye watering!

    On a side note, what would you recommend as the minimum internal fillet radius? Or should I leave internal corners as right angles and assume it will be filleted to whatever when machined?

  7. #157
    Not much progress with the machine at the moment... I've gone off on a tangent with designing an Ethernet motion controller for Mach 3 (don't ask how that happened!)

    On a side note, I also have a job request up for yet another project I'm currently working on: http://www.mycncuk.com/threads/9328-...Parts-Required

  8. #158
    Well the time has finally come... I THINK I'm finally finished!

    I've decided to keep the steel end plates. I can get them cut for free (which is a big plus) and I'll paint them to help prevent bi-metallic corrosion.

    Click image for larger version. 

Name:	Fin1.JPG 
Views:	280 
Size:	104.1 KB 
ID:	16920Click image for larger version. 

Name:	Fin2.JPG 
Views:	276 
Size:	54.0 KB 
ID:	16921Click image for larger version. 

Name:	Fin3.JPG 
Views:	269 
Size:	41.4 KB 
ID:	16922Click image for larger version. 

Name:	Fin4.JPG 
Views:	252 
Size:	88.3 KB 
ID:	16923

  9. #159
    Looking good now.

    The X axis stepper motors have the adjustment slots horizontal - will this actually give you much belt length adjustment? Any reason the slots cannot be vertical?
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

  10. #160
    Quote Originally Posted by routercnc View Post
    Looking good now.

    The X axis stepper motors have the adjustment slots horizontal - will this actually give you much belt length adjustment? Any reason the slots cannot be vertical?
    Good spot! I just checked and only have 3mm of belt length adjustment... I'll make the slots vertical!

Page 16 of 28 FirstFirst ... 6141516171826 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. aluminium profile for cutting bed of router
    By steeplejack in forum Marketplace Discussion
    Replies: 3
    Last Post: 19-10-2013, 10:52 PM
  2. BUILD LOG: New CNC router 8x4 For Cutting Multiple Materials
    By ciscoeuk in forum DIY Router Build Logs
    Replies: 19
    Last Post: 03-02-2013, 02:01 AM
  3. Multiple CNC Opportunities both Nationally and Internationally
    By cnc jobs in forum Opportunities Available & Sought
    Replies: 0
    Last Post: 21-09-2012, 01:01 AM
  4. WANTED: CNC Mill/Router for Cutting Aluminium
    By kylelnsn in forum Items Wanted
    Replies: 5
    Last Post: 09-08-2012, 09:54 PM
  5. Test cutting materials
    By Kai in forum General Discussion
    Replies: 6
    Last Post: 05-12-2010, 10:27 AM

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
  •