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Type: Posts; User: awerby

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  1. Replies
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    Re: NewBie Technical Guy

    That Shapoko might work for cutout work and flattish 3D things, but it doesn't look like an especially promising candidate for conversion to a 4-axis machine. Are you putting that wish on the back...
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    Re: NewBie Technical Guy

    Your $2500 will go further towards building a machine than purchasing a new one. But it might not get you everything you might hope for. Will this be a dedicated 4-axis machine, which is set up to do...
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    Re: Milling Silver with CNC Router

    You might also look into spray etching. It's good for making delicate cut-out parts from thin flat sheets of metal without distorting them. Here's someone who does it:...
  4. Re: DIY Converting old engraver to full CNC router

    Actually Linux is a realtime OS, or can be used that way. It can run stepper drives as well as servos, although the realtime function is only relevant to closed-loop operation. The problem with the...
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    Re: Milling Silver with CNC Router

    A milling machine, which is designed for cutting metals, would be a better choice than a router, which is intended for wood and other soft materials. The spindle in a router can only run at high...
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    Re: Need some advice hit a dead end

    If you go into BIOS and check the LPT ports, does it find a parallel port running in EPP mode? If not, can you switch it to EPP? If you can't find a computer with a working parallel port, it might be...
  7. Re: Building a CNC router/mill for aluminum and light steel, looking for design criti

    Have you cast this concrete frame yet? That seems to be the most critical feature of this design, and also the most unique. Concrete normally shrinks a bit as it sets, so casting steel bars into it...
  8. Re: Building a CNC router/mill for aluminum and light steel, looking for design criti

    What's the backlash from those gearmotors? The nuts will compensate for backlash between them and the screws, but not for backlash in the gear train.
  9. Re: Lead. Its heavy - has anyone CNC pocketed a mould for it?

    Since lead melts at 612 degrees F and cardboard burns at about 450F, I'd be reluctant to trust a cardboard tube as a mold for lead, even if it was lined with foil. It would be safer to heat up some...
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    Re: Need advice heating thin o1 tool steel

    MAP gas is hotter than regular propane, but not by much. It could work (eventually) for small pieces like you describe, but it will always be a limiting factor. Use insulating firebrick, not the hard...
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    Re: CNC 3018 Y Axis - horrible jogging noise

    You get a machine from "BangGood" and you're surprised that it bangs so well? Try dialing down the acceleration on the axis giving troubles, see if that helps.
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    Re: Are there steppers any good

    I found another site with more info on those motors (and in English). The inductance, at 3.8 mH, is on the high side. To get the best performance out of them, you'd need to supply 62 volts of DC. As...
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    Re: Screw options for small knee mill

    Ball screws are easier to back-drive, so you'd need to lock down any axes you weren't using at the time. They'd be more expensive than regular acme leadscrews, and unless you bought ball screws with...
  14. Re: 3D printed patterns for casting a benchtop mill

    Have you ever done sand casting? It doesn't involve the use of warm or hot sand (unless you live in Phoenix). The pattern will retain its form just fine, but as was pointed out, that could be a...
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    Re: Need advice heating thin o1 tool steel

    If you're talking about a regular propane torch that screws onto a hand-held bottle of gas, that would be marginal - it could work if your piece is small enough, but might not put out enough heat....
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    Re: Need advice heating thin o1 tool steel

    You can use stainless foil and charcoal granules to avoid oxidizing the surface, if that's important to you. Make a sealed package with the foil that has the steel and the granules inside; the...
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    Re: Screw options for small knee mill

    You could use a ball screw for this. There's enough loading from the weight of the bed that backlash won't be an issue, even if you were using it in CNC mode to drive Z, Since it's a manual mill, the...
  18. Re: 6090 CNC experiencing friction and shakiness - noob help!

    If you follow wmgeorge's directions and can't find any binding or other mechanical issues, try swapping the cables feeding Y with those feeding X, then power the system back up and see if the Y axis...
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    Re: Bar stock various sizes and types

    The pictures show rod, which is round in cross-section, not bar, which is rectangular.
  20. Re: Hobbyist in south bay area / San Jose, seeking rental time on mills

    If Oakland's not too far to travel, you could come over and play with milling machines at my place. Can you speak Linux?
  21. Re: Somehow my machine is only accurate when running handwritten g-code

    It sounds like it's applying an offset to run inside the rectangle instead of outside it. If your hand-written Gcode works, but the Fusion-generated code doesn't, it's not likely to be a Mach4...
  22. Thread: meaning of SBP

    by awerby
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    Re: meaning of SBP

    Shop Bot Program
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    Re: Anybody know what brand this bandsaw is

    Does it work?
  24. Re: Bench Top CNC for cutting Copper/Brass sheet?

    Don't waste your money on a $500 CNC mill; it's just going to disappoint you. Instead, send the work out to someone with a waterjet or fiber-optic laser cutter; you should be able to get quite a bit...
  25. Thread: Totally Lost

    by awerby
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    Re: Totally Lost

    If the code as written seems to be sending the tool to the right coordinates at the outset, but instead it's going somewhere else, I'd suspect some of those G-codes at the top of your program. Try...
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