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Type: Posts; User: pippin88

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  1. Replies
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    Re: 14x8x14" Mill Build, Advice Appreciated

    BK mounts are only about 100N/um stiffness
  2. Replies
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    Re: 14x8x14" Mill Build, Advice Appreciated

    Larger ball screws do have higher axial rigidity

    Longer and double ball nuts have higher axial rigidity
  3. Replies
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    Re: BST automation vs dy-global eBay

    Craig there are no physical signs of rolling. They do not have the little grooves in the crest (major diameter) that rolled screws do.

    Are they the same standard as a premium brand name? Probably...
  4. Replies
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    Re: BST automation vs dy-global eBay

    Craig you are incorrect

    TBI make ground ball screws, as well as rolled (like every manufacturer). Loon at their catalog.

    I have three ground TBI ball screws in my shed.
    The difference between...
  5. Replies
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    178

    Re: Help with compatible servomotor

    v102: Are you replacing the servo motor only (trying to use an existing drive) or are you replacing servo motor and drive together?
  6. Replies
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    Re: Help with compatible servomotor

    Craig, you are going to have to buy Delta B3 or E3 in the future. Apparently E3 is replacing B2
  7. Re: Linear Rail Alignment & Stability in My First CNC Build

    2 metres per second = 120 metres per minute = very fast

    20g is massive acceleration

    Your frame is completely unrealistic for what you want
  8. Re: Granite Base Moving Gantry - Looking For Feedback

    Buy the ready made cables!

    Usually:
    Step pulse, ideally differential, therefore 2 wires
    Direction pulse, ideally differential, therefore 2 wires
    24v or 0v (depending on preference/wiring)...
  9. Replies
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    Re: running ten stepper motors from PC?

    Is the motion fixed / always the same? Or will you change programs?

    Could do with an arduino / microcontroller (or multiple) if you don't need to change the program. Also possible to change...
  10. Replies
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    Re: Where to buy Linear Rails & Ballscrews

    Yes you should buy from a store that specialises in that type of product.

    Fred / BST Automation is great for linear rails and ball screws.
  11. Replies
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    1,162

    Re: BST automation vs dy-global eBay

    Always check how bolts will work

    You will likely want flanged linear rail cars - they can be bolted from below
  12. Re: Do I need linear rail next to ball screw on the vertical axis?

    You need to provide a picture / model.

    It sounds like you are asking about 2 rails on each side? 4 rails for one axis? It is very rare that more than 2 rails per axis is beneficial

    HGR is...
  13. Replies
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    Re: Where to buy Linear Rails & Ballscrews

    BST Automation on aliexpress
    Fred is very reliable
    Has been a seller since 2011
  14. Replies
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    Re: BST automation vs dy-global eBay

    Max feed rate 500mm/sec
    Screw length 500mm
    Acceleration time 5 sec

    You will never get close to max feed with that acceleration time

    Acceleration is a major determinant of torque required
    ...
  15. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Why worry so much about air? That small amount of air should reduce modulus by only a small amount.

    You get a much bigger stiffness increase by increasing section size by a little bit. 10%...
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    Re: ISO30 tool holder marks: is this normal?

    If multiple tool holders have similar marks, the spindle taper is damaged.
    Probably had chips jammed in.

    Often fixable with some work.

    A ding / scratch in metal will usually result in a...
  17. Replies
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    Re: The beginnings of a new cnc mill

    I have personal experience of epoxy creeping when used under linear rails / ball screw mounts. I don't have a measurement, but there was a visual impression / outline in the epoxy.

    I would not use...
  18. Replies
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    Re: New machine Build - Motor torque required

    From my understanding the 900kg is a vertical load on top of the plate with a rolling element (caster wheel) between the moving plate and the load.

    I.e. the 900kg load is fixed horizontally, and...
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    Re: Cable Drag Chain

    https://www.igus.com/info/energy-chains-select-bend-radius-cable-carrier-ca

    https://dynatect.com/resources/how-to-size-your-cable-carrier/

    Bend radius may be the centre of the drag chain (not...
  20. Replies
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    Re: New machine Build - Motor torque required

    32mm is overkill for 300mm travel

    You can use a much smaller screw, such as 16mm, which will require much less torque to spin.

    From my understanding of your description:
    You are moving a plate...
  21. Re: Granite Base Moving Gantry - Looking For Feedback

    My limited understanding was that vector mode's main advantage is better low speed torque, and slightly tighter speed regulation (which doesn't really matter at higher speeds usually)
  22. Re: I'm attempting to build a machine to kind of mimic a robot..

    I have practical experience of what Peter is saying about epoxy levelling.

    Even with super slow hardener, epoxy did not self level unless 5-6mm deep.

    Epoxy is soft. Over time it has crept -...
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    Re: Speeding up my stepper

    Servo would be a better choice

    Stepper plus gearbox (to increase resolution) will be poor for high speed
  24. Re: Flat end turns melting hot on machining rusted steel

    Where did you get the settings from?

    15mm/minute feed rate is very slow. Feed too slow = rubbing = heating and dull tool
  25. Re: Lapping aluminium extrusions using a straight edge

    What brand rails and what preload?

    Some rails are meant for rapid travel and loose positioning - they have no preload and have a bit of play when force applied.
  26. Re: Need help with cutting insets in spacers for o-rings

    What is this for?
    What is a 'spacer'?
    Why does it need orings in the end?
    How precisely do the orings need to be aligned in relation to 1. the spacer and 2. each other?
  27. Replies
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    Re: I need help choosing the first machine

    Agreed

    $2000 will not get a machine you can use for aluminium with good tolerances, or any decent machining speed

    Anyone claiming to make 500k a year with a machine that cost 5k is BS. Let me...
  28. Re: Baldor servo motor replacement and continuous power draw.

    Modern servos are usually sold in a set with driver, servo motor, and cables.

    The price quoted above is for a set with driver, servo motor, and cables.
  29. Re: Breaker sizing for CNC cabinet (AC servos and VFD)

    That's because a lot of people don't understand that circuit breakers are to protect the wire (not the component / appliance) and stop excessive current draw resulting in fires.
  30. Re: Granite Base Moving Gantry - Looking For Feedback

    Not hard to download the LinuxCNC live installer and have a play.
    There are simulations built in, so you don't need CNC hardware to have a look.

    A standard machine is easy to set up with the...
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