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Thread: Devastator's Ongoing Solsylva Build

  1. #157
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    Default Re: Devastator's Ongoing Solsylva Build

    A good article in Popular Mechanics about the US Navy ramjet missile I machined the fin cans for on the Solsylva. Navy Builds Ramjet Missile with Model Rocket Engines and a Credit Card

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    So I am at college and at my university I have unlimited free access to materials, most of which is a ton of aluminum stock and steel, as well as water jet, CNC milling machines and very large gantry. This gave me the idea that I can upgrade my machine at home for no cost other than my time, so my question is what should I upgrade on my solsylva first, mostly to minimize backlash on all axis? Or I could probabaly build a completely new machine but that would take too much of my time making the parts.



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    Default Re: Devastator's Ongoing Solsylva Build

    Quote Originally Posted by jlowe1224 View Post
    So I am at college and at my university I have unlimited free access to materials, most of which is a ton of aluminum stock and steel, as well as water jet, CNC milling machines and very large gantry. This gave me the idea that I can upgrade my machine at home for no cost other than my time, so my question is what should I upgrade on my solsylva first, mostly to minimize backlash on all axis? Or I could probabaly build a completely new machine but that would take too much of my time making the parts.
    If you have access to that, I'd say go for it. Solsylva is only for people with no money or resources, IMO.



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    Default Re: Devastator's Ongoing Solsylva Build

    A 7075 aluminum rocket fin with bevels and polish. Finish pass was 1/8" ballnose with 5% stepover.

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    Default Re: Devastator's Ongoing Solsylva Build

    That's a really nice finish!

    What's the dimension of this fin?

    Is the 7075 really harder to machine than 6061?



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    Default Re: Devastator's Ongoing Solsylva Build

    Thank you!

    Machined area of 6" X 13". 7075 is just slightly harder than 6061, but machines cleaner because it is not as soft. I like the way it polishes too.



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    Default Re: Devastator's Ongoing Solsylva Build

    Finished in copper anodizing. Pretty convincing.

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    Default Re: Devastator's Ongoing Solsylva Build

    I've got a problem that's been driving me crazy for awhile. When I use my rotary axis, Mach 3 is ignoring acceleration settings during Z retracts. Only after every "A" move. Anybody know a workaround? The only thing I can think of is to slow my Z speed way down but I'm doing engraving files so that would double my processing time. Maybe some sort of post processor that codes in the acceleration after every "A" move?



  9. #165
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    Default Re: Devastator's Ongoing Solsylva Build

    Sounds like you've run into the Mach3 trajectory planner bug.
    The only real workaround might be to add a short move before the retract.
    Most people that I've seen, that run into this bug, stop using Mach3 altogether, and move on to a better control.

    Gerry

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    Default Re: Devastator's Ongoing Solsylva Build

    If you're just engraving, you could try making another Mach3 profile and set your rotary axis as your Y axis; use the circumference of your part to figure out steps/inch.



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    Default Re: Devastator's Ongoing Solsylva Build

    Quote Originally Posted by louieatienza View Post
    If you're just engraving, you could try making another Mach3 profile and set your rotary axis as your Y axis; use the circumference of your part to figure out steps/inch.
    That's what I'm doing already because I'm only using a 3 axis driver. So I unplug the Y and plug in the A, then load my mach profile.

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    Quote Originally Posted by ger21 View Post
    Most people that I've seen, that run into this bug, stop using Mach3 altogether, and move on to a better control.
    Ok, thanks. Been considering that for awhile.



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    Quote Originally Posted by Devastator View Post
    That's what I'm doing already because I'm only using a 3 axis driver. So I unplug the Y and plug in the A, then load my mach profile.
    With your A axis as A in Mach, or Y?



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