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Type: Posts; User: awerby

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  1. Re: machining hard wood, examples of methods and feeds and speeds

    I've been cutting walnut quite a bit myself lately. My spindle is bigger than yours, but I haven't been pushing it as hard - maybe that's why it's not screaming as loud (although it's more...
  2. Re: Mach 3 going out of the toolpath, no step loss (i think)

    That's an important clue. Yes, noise from the spindle can cause step loss (or gain). Often it happens because the wires between the spindle and VFD are unshielded, which allows them to act as a...
  3. Re: Mach 3 going out of the toolpath, no step loss (i think)

    After it's done all that, and you tell it to return to XYZ zero, does it go to the same place where you set those values? If so, it's probably a problem with your tool paths. If not, it's either lost...
  4. Re: Need Advice On CNC Vertical Mill Parts DIY Epoxy Granite Hard Milling Steel

    You don't say how large the machining envelope on this machine is supposed to be, or what its proportions are. This is critical, both to how well it will perform and how much it will cost to build....
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    Re: Mach 3 Feed approx 10% slower than Gcode

    What happens if you tell it to go 10% faster?
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    Re: Fixed gantry or column for mill rigidity?

    If the ways are really shot, you might be able to mount some beefy linear rails in their place; there are plenty of newer mills that use them instead of the older style of ways. Then replace the...
  7. Re: Looking For Examples of High Lead Ballscrews With Gear Reduction in Z

    What would be the point of adding gear reduction to a ball screw? A preloaded ball screw will eliminate backlash, but the gears will add it back. If you've got a high-lead screw, you can drive it...
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    Re: Fixed gantry or column for mill rigidity?

    It sounds like you need to find another Bridgeport with a good base but a bad head (assuming yours is in good shape).
  9. Re: Good pre-made Z axis assembly with linear rails?

    It sounds like an automation-quality linear actuator would work; I've used them for Z axes before. You can often find them used or surplus with motors on them nobody can figure out. They often have...
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    Re: Milling aluminum 6061 - hazy finish

    Did they do any post-machining finishing on those matte parts? Like vibro-tumbling, bulk deburring, anything like that? Ceramic media often leave a finish like that.
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    Re: Gantry Design Biomimicry

    It seems that the main torsion would happen if the Z axis was fully extended downward and was in the middle of the beam. Any pushing back and forth at the spindle would stress the attachments of the...
  12. Re: DIY waterjet machine - cutting head sources?

    Maybe you could find one that's a replacement part for a WAZER?
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    Re: Gantry Design Biomimicry

    It seems that filling a hollow composite gantry beam with liquid would negate its major advantage, which is light weight. But I agree that casting something that's curvy and triangulated would be...
  14. Thread: A New Attempt.

    by awerby
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    Re: A New Attempt.

    Use the castable refractory to line your furnace, keep the rest of that stuff for other projects. If you don't have enough refractory, get some more.
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    Re: Very much on the side of confused...

    If you look on page 17 of this manual https://virag-hightechcnc.hu/uploads/Manual_Guide_i_ENGLISH_OPMCP03ER002.pdf , it talks about that, but unfortunately it's in Chinglish so figuring out what...
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    Re: Gantry Design Biomimicry

    It's an interesting question, Peter. A lightweight part is what attracts me to the idea of a composite beam, and the vacuum-bag process opens up a lot of design possibilities that you don't get with...
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    Re: I have no clue what I'm doing

    In Inventor, you'd make a 2D drawing and save it as a DXF file. But it won't run the CNC router by itself; for that you'd need to process it through a CAM program to generate G-code that the router's...
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    Re: Fixed gantry or column for mill rigidity?

    Too bad you're so far away, or I'd order a composite gantry beam in Tetrium for the new machine I've been dreaming about. What would something like that cost, about 2 meters long?
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    Re: Backyard lost foam aluminium casting

    I've heard of people using a thin layer of wallboard joint compound to coat their foam models prior to casting, but I've never tried it myself. Make sure to let it dry out thoroughly before pouring...
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    Re: Fixed gantry or column for mill rigidity?

    Are these improved router and mill parts just for your personal use, or are you planning a commercial venture with them?
  21. Thread: Feed questions

    by awerby
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    Re: Feed questions

    The first thing you need to figure out is the "chip load per tooth" of the endmill you plan to use, for the material you want to cut. Here's one for metals that's metric:...
  22. Re: Shapeoko, V-Carve or Onefinity? Here is what I decided...

    One of these: https://www.cncrouterparts.com/pro4848-4-x-4-cnc-router-kit-p-251.html ? Did Avid tell you that this machine would mill cast iron? What non-ferrous metals did they say it would work on?...
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    Re: machine rpm speed range question

    High-speed spindles like that usually need to run at a high percentage of their maximum speed, or they'll overheat, since the internal fan isn't running fast enough to cool it down. If you've got a...
  24. Thread: New Project!

    by awerby
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    Re: New Project!

    Judging from the bolts shown in the second picture from the top, it looks like the column can be separated from the base. But disassembling the two parts would require disconnecting every electrical...
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    Re: Which CNC router should I use?

    I'm not seeing your images, but the primary question isn't detail but material. What did you want to make these things out of? If the material is soft enough and its size is small enough to fit its...
  26. Re: Noobie CNC name plates for custom projects

    One of these: https://carbide3d.com/nomad/ ? They don't claim it can cut stainless steel; it's intended for soft metals like aluminum, and only for small amounts of that. " Cut Small Metal Parts:...
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    Re: heat spindle and incredible inverter...

    How fast is the spindle turning? Spindles like these need to run at a high proportion of their top speed, because they rely on the internal fan for cooling. So the slower it runs, the hotter it will...
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    Re: Vaccum pods design

    Vacuum is usually used for fixturing flat things, like plywood. It sounds like you're expecting it to hold onto the bottom of a fairly tall thing while you machine on the side of it. I really doubt...
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    Re: Need help with material choice

    If you don't have to use any particular material for this, I'd suggest one of the polyurethane tooling boards, like Renshape or Butterboard. This material is available in a range of densities; you'd...
  30. Re: Advice please regarding best combination stepper motor and driver

    Have you bought all that electronic stuff already, or are you asking us what to buy? If it's the latter, I'd advise against those drivers; there are long threads here about how badly they work...
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