510,081 active members
2,680 visitors online
Register for free
Login

Search:

Type: Posts; User: peteeng

Page 1 of 20 1 2 3 4

Search: Search took 0.02 seconds; generated 35 minute(s) ago.

  1. Re: which any stepper motor and driver should use for 4*2 cnc router machine

    Hi Ibrahim - so you mean a 2mx4m machine ? very big. All my comments remain the same. A 2m wide gantry in metal is a very heavy object but if the machine is only intended for woodwork a ply machine...
  2. Re: which any stepper motor and driver should use for 4*2 cnc router machine

    Hi Ibrahim - The accuracy depends on the axis drive system. Std 200 step steppers can achieve very high accuracy. Comes down to the belt/screw/drive nuts/rack and other bits you select to how...
  3. Replies
    415
    Views
    14,897

    Re: Designing new Router called Maximus

    Hi All - Here's a couple of articles on machine design. One is on damping, the other design. The design article has an area on EG. I like the uni lecture notes, covers a lot of territory. Even has a...
  4. Re: basic help for newbie cnc milling - z axis needs double

    Hi - In the config area of the CAM you will need to change the steps per unit value of the Z axis so it movement corresponds to the correct distance. Apparently this value needs to be halved....Peter
  5. Re: which any stepper motor and driver should use for 4*2 cnc router machine

    Hi Ibrahim - Nema 23s and buildbotics get you all of this. Peter
  6. Replies
    2
    Views
    23

    Re: Low Cost - CNC Router design

    Hi Tom - The long axis with a gantry can be driven on small machines with one drive (screw or belt) under the table via a saddle. On large machines its usual to drive the long axis with two motors,...
  7. Replies
    10
    Views
    8

    Re: crane style cnc machine

    Hi Dingo- You are now talking about making a mill. That's a really big step up in rigidity over timber and plastic. You say "metal" is steel in those thought bubbles or only aluminium?

    aluminium...
  8. Replies
    18
    Views
    76

    Re: New 2x4' router build

    Hi Keonbro - Unfortunately I don't think you can future proof these things, as we don't know what the future brings or needs. But you can use your 2x4 to make the next machine and next machine once...
  9. Re: New Machine Build - Massive CNC router for timber components

    Hi All - I've been looking for the place that the "rivet" image I placed earlier came from. I've finally found it!! It's the Newark Penn Station. Looks a grand structure. Arches in two directions...
  10. Replies
    10
    Views
    8

    Re: crane style cnc machine

    Hi Dingo - I think you need to rethink the config. To move radially 0.25mm at 6m radius requires a move of 0.00119deg. If you used a std 200step stepper this would require a gearbox with a 1513:1...
  11. Re: Moving table (fixed gantry) with two ballscrew

    Hi Ivan -Thanks for offer but yes its expensive Europe to Oz. I found some milled carbon fibre in france that I wanted. 20 euro/kg for the sample and 180 euro to get it here. I'll have to wait until...
  12. Re: Moving table (fixed gantry) with two ballscrew

    Afternoon here Ivan :) Good keep us up to date. I too am re starting a moulded cnc mill design so thanks for your help so far. I'm trying to get the biresin here in OZ but seems sika don't stock it...
  13. Replies
    3
    Views
    7

    Re: Two Axis CNC Table

    Hi Agaylor - I suggest you use belts in such an application. A 10 or 16mm AT belt would work fine. Use 15 or 20mm rails and cars and NEMA 17 or 23 steppers. Depending on the speed / acceleration you...
  14. Replies
    10
    Views
    8

    Re: crane style cnc machine

    Hi Dingo - You will have to find a clever maths person who can do a jacobian transfer of the co-ordinates so a std 3 axis system output can be translated into the cylindrical co-ords of your system....
  15. Re: Moving table (fixed gantry) with two ballscrew

    Hi Ivan - Yes segregation is a big problem when aiming at high packing factors. More reading this morning and most concrete mixes in reality are about 70% Vf maybe 75% in the lab. The theories that...
  16. Re: Moving table (fixed gantry) with two ballscrew

    Morning Ivan - So what are you aiming at? Industry information tells us that 70%Vf is about the top figure and you have achieved that. Are you chasing 90%? Industry has settled on 70%Vf for a reason....
  17. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Buoyen - 400 is a bit thicker than many out there. But it will work. Look up Biresin CR83 via SIKA. 155 mpas and longer gel time. The longer gel time allows the resin to wick into corners and...
  18. Re: Moving table (fixed gantry) with two ballscrew

    added the resin data sheets - Peter
  19. Re: Moving table (fixed gantry) with two ballscrew

    Hi Ivan - some updates on the quartz stiffness now some groundwork has been done. I have always thought quartz was E=70GPa but seems being a crystal it is anisotropic (always a fly in the ointment)....
  20. Re: Moving table (fixed gantry) with two ballscrew

    Morning Ivan - Your doing fine with your english and the tests. When you quote a ratio or % always state whether its by weight or by volume so others know what you mean. Also as a note you will...
  21. Re: Building Steel Frame Gantry Router for wood, MDF, and maybe more

    Hi Machine dud - any photos, we like to watch. Yes I have discussed lots about bolts, rivets, brazing and other ways to build machine frames. The friction in bolted joints make it damper then a...
  22. Re: Moving table (fixed gantry) with two ballscrew

    Hi Ivan - Here's the rub with packing. If we look at a 2D representation using spherical particles we get a possible 2D packing factor of 91% and in spheres 3D it's a bit better. But clearly no one...
  23. Re: Moving table (fixed gantry) with two ballscrew

    Hi Ivan - I would stay in cast epoxy world or steel world. The tube inner will vibrate and being stiffer then the casting may be the dominate structure then you may as well have fabricated it. If...
  24. Replies
    45
    Views
    367

    Re: Jake's 4x8 CNC Build

    Hi Jake - Thats a good question and can't be answered without some calculation. Machine stiffness is measured in two ways: static and dynamic stiffness. Dynamic is difficult to measure but very...
  25. Re: Moving table (fixed gantry) with two ballscrew

    Ivan - I don't think you need strength you are chasing stiffness. Rebar is added to concrete to improve tensile strength and to create a loadpath thru the concrete when it cracks which it does and...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4