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  1. #351
    Bad luck Chaz

    However I do seem to remember posting this about a week ago (post #283)

    "However my personal preference on big powerful machines is to have the home switches inside the boundries set by the limit switches, and have the limit switches trigger powering off of the drives. Also to have the limit switches within the boundries of mechanical stops that limit travel before ball screws over travel."

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  3. #352
    Quote Originally Posted by AndrewMawson View Post
    Bad luck Chaz

    However I do seem to remember posting this about a week ago (post #283)

    "However my personal preference on big powerful machines is to have the home switches inside the boundries set by the limit switches, and have the limit switches trigger powering off of the drives. Also to have the limit switches within the boundries of mechanical stops that limit travel before ball screws over travel."
    Hi Andrew, would a latched relay be suitable to perform the functions you describe?

  4. #353
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Quote Originally Posted by Desertboy View Post
    Hi Andrew, would a latched relay be suitable to perform the functions you describe?
    Andrew, yes, point made. I thought of the same.

    Desertboy, fairly easily done with the CS Labs. It has sub 100ms error checking and can instantly disable the servos in a fault / trip condition.

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  6. #354
    I think the main point is to have a physical limit to save the ball screws if there is a runaway - preferably with a hard neoprene or other suitable plastic buffer.

    As for the latched relay then yes that's the easy way to do it, but it needs to be a fast acting relay.

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  8. #355
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Suppose this means it works.



    Speeds and Feeds

    24000 rpm - 6mm endmill
    Cutting Rate 4000mm/min
    Lead / Ramp at 1440 mm/min

    This was run at 80% speed. Overall happy with the cut considering there is no finish pass.

    DOC is 5mm, WOC is 1.2mm

    Still got more to do, but happy with the initial results.

    Last edited by Lee Roberts; 25-06-2017 at 02:04 PM. Reason: Added video

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  10. #356
    Excellent - congratulations !

    BTW do you still want those Compac PC's ?

  11. #357
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Quote Originally Posted by AndrewMawson View Post
    Excellent - congratulations !

    BTW do you still want those Compac PC's ?
    Please, ill make a plan to come and collect. Dont chuck them please.

  12. #358
    I haven't felt any disturbance in the force yet, I think you need to up the ante.
    Milling cutters start to perform around 3/4" diameter and up, anything less than that is squidgy

  13. #359
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Quote Originally Posted by Robin Hewitt View Post
    I haven't felt any disturbance in the force yet, I think you need to up the ante.
    Milling cutters start to perform around 3/4" diameter and up, anything less than that is squidgy
    Agreed.

    Just did some test cuts, 10m/min with 10mm endmill. 0.5mm Stepover (wimpy, im still testing) and around 20mm of depth. The surface finish is superb.

  14. #360
    Chaz's Avatar
    Lives in Ickenham, West London, United Kingdom. Current Activity: Viewing Has been a member for 4-5 years. Has a total post count of 963. Received thanks 67 times, giving thanks to others 42 times.
    Will do some more cutting tomorrow with 10mm endmill.


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