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Type: Posts; User: alan_3301

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  1. Replies
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    Re: CRP4848 in NC

    I usually use a mixture or wd-40 and ATF when doing aluminum, but I couldn't find my spray bottle, so I grabbed a can of pb-blaster to soak it down a couple of times before the cut.

    I doubt it was...
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    Re: CRP4848 in NC

    Thanks, It's the machine in this build thread. An original version of the cncrouterparts 4848 machine, with a chinese 2.2kw spindle
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    Re: CRP4848 in NC

    Finally got around to cutting some steel on this thing. This is a 12-1 tooth trigger wheel for a motorcycle fuel injection system.

    Material is 1/8" A36 Hot rolled steel sheet.
    Cutting bit is a...
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    Re: 3D toolpathing to 3D Model

    I have used fusion 360 to save toolpath simulations as solid models, in order to use it as stock for subsequent operations.
  5. Re: Are Chinese servos a gamble? Servos vs Leadshine closed loop

    May or may not help you, but I use a 500SV46B buck boost transformer, wired as an autotransformer, so that only the stepdown load is run through the transformer. In this case, I am able to lower 245V...
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    Re: Routing sheet metal

    You are wasting your time with HSS in a router. You need to buy a carbide end mill.
  7. Re: New here and i have a qustion about this sherline

    Those are stepper motors. You might want to open up the box to see what each of the db25 connectors go to. If you can find documentation somewhere, you should be able to configure it to run on a pc...
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    Re: Routing sheet metal

    I'm guessing your router is fixed at 20k rpms or so?
    Get a 3/32" short 2 flute carbide end mill and cut full depth at 20k rpms and 10 ipm.

    Your HSS bit will just burn up at router speeds.
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    Re: Cutting 1" thick aluminum on CNC

    I have cut 30mm aluminum plate on my cnc wood router, using both a cheap chinese 6mm x 30mm long single flute solid carbide, and a home depot freud 2 flute spiral solid carbide bit with only a 1" cut...
  10. Re: LinuxCNC HAL Driver. Undefined reference to hal_export_func

    I'm guessing because that file is way outdated, and not rewritten since the emc2 -> linuxcnc name change.

    Are just trying to get linuxcnc going, or are you experimenting for a custom...
  11. Re: Process for Lost Foam Ceramic metal casting explained?

    What material will it be cast in? I have cast aluminum using blue extruded polystyrene (XPS) coated in drywall mix, then suspended in sand.
    The foam can be joined with hot glue, and doesn't need to...
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    Re: Budget square rails

    Do you think they were binding, or did it seem like they had a high preload?
  13. Replies
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    Re: How Close to Charlotte, NC are you?

    Checking in from Raleigh... Wish there was more of a scene here that I knew of. I would love to collaborate on projects, but unfortunately no time for travel.
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    Re: DIY Linear Guide

    Sorry, but it looks very complicated to assemble, and very weak. Unless you have a surplus a steel U-channel that you must use, I would copy the design of cncrouterparts for a cheap and easy setup....
  15. Re: Damage to linear motion rails / Bearing wear

    Totally normal for that setup. skate bearings on CRS isn't really a precision system, but it works amazingly well for what it is.
  16. Lathe threading inserts use and direction IR IL ER EL

    Is there a difference between an external left hand threading insert, and an internal right hand insert?
    Same goes for external right and internal left.

    Can an ER insert fit an IR holder? Same...
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    Re: Water cooling my spindle

    copied from the youtube description:

    cutting aluminum on crp4848
    Onsrud 65-025 Carbide
    0.25" Slot cut @ 0.083" DOC 34IPM 11400RPM
    Total cut time ~5hrs w/ profile, grid, and chamfer.
  18. Replies
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    Re: Water cooling my spindle

    This one was about 5 hours of cutting time. I don't remember more than 2 or 2.5 amps. Spindle did get warmer than ambient, but not by much.

    https://www.youtube.com/watch?v=UhwZqgQjlak
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    Re: Water cooling my spindle

    I've had a dinky fountain pump slowly pumping a trickle through the spindle into a bucket for a few years now. That trickle stopped about 6 months ago, because of a small bacteria plug in the spindle...
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    Re: Thoughts on this spindle?

    What's up with the air port on the bottom?
    Personally I would get rather get this spindle for almost 1/4 the price and just replace them as needed.

    ER20 2.2KW WATER-COOLED SPINDLE MOTOR ENGRAVING...
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    Re: Ballnuts Falling Apart

    Not sure if they are the same as the chinese ones I have, but did you check the tiny set screws that hold the wiper in place?
  22. Re: Lessons in overkill! Welded steel, fixed gantry router

    I have no data to back it up, but I think 1000rpm is a big stretch for those motors. I don't know what drivers you will use, but I would bet on 300 rpm reliably. That would give you 1500 mm/min.
    ...
  23. Re: Gantry mill for precise milling of aluminium

    Beautiful work. I was surprised to see Mach3 running on a linux fan's build (why no linuxcnc?).

    Also, unless you made sure against the specs of those ballnuts, I would say you are running them too...
  24. Re: what is a Shopmaster Eldorado currently worth

    On your archive.org link, you can click "TO SEE SPECS ON THESE OLDER MACHINES CLICK HERE"

    Then down that page is lists el dorado.
  25. Re: Lathe Spindle Drive Options - AC Servo vs BLDC vs Stepper vs DC Brushed

    If you found a good deal on the yaskawa then go for it. I think you would do ok with a 400W AC servo, you can find a set cheaper than the 750W.
    I am using a delta 750W servo for the spindle drive on...
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