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Type: Posts; User: Goemon

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  1. Replies
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    Re: the best steel type

    Does anyone know how hardening steel would effect it's strength?

    I thought that hardening steel made it brittle which was why they used differential tempering on swords.

    Obviously cutting tools...
  2. Re: hole drilling with a high-speed (low-torque) 3-axis CNC router?

    Where does the info on cnc router spindles not being able to handle axial loads (and whatnot) come from?

    I'm far from being an expert but it sounds wrong...

    Even a cheap Home Depot router...
  3. Re: What are the essential tools to build an epoxy granite cnc

    I spent a long time agonizing over that myself before going ahead with my build.

    Thanks to all the failed small businesses ebay is full of low cost used VMCs and old Bridgeport style mills etc.
    ...
  4. Re: What are the essential tools to build an epoxy granite cnc

    The great thing about epoxy granite is that you don't need many special tools.

    For casting the epoxy granite machine base you'll need something to make a mold out of and mold release to start...
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    Re: GWizard default surface speeds

    The last thing I need is another calc. I already know that different calcs produce different numbers and in most cases they are no more useful than a guess for high speed machining.

    I've chosen...
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    Re: GWizard default surface speeds

    I'm just using the tab (in GWizard) called "feeds / speeds".

    For example, if I select aluminum 6061 with a 2 flute ZRN coated carbide 1/4" end mill, it defaults to a surface speed of 1560 sfm....
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    GWizard default surface speeds

    Do you guys use the default surface speeds in GWizard or do you amend them with data from elsewhere?

    The default numbers for an uncoated carbide 2 flute end mill for aluminum are considerably...
  8. Replies
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    Re: Reversing axis direction in linuxcnc

    I'm using stepper motors via a Geck G540. There are no axis direction switches on the hardware (at least not that I can see on the outside).

    Is there an advantage to reversing the wires on the...
  9. Re: Which material is the best for injection mold tooling?

    It comes down to how many parts need to be made with the mold and budget.

    Large volume industrial injection molds are made from steel.

    Short run or prototype can be made from aluminum.

    The...
  10. Replies
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    Re: Reversing axis direction in linuxcnc

    I initial set it up using stepconf but I was hoping to change it without going through the whole set-up again.

    When you say change the sign of the output scale, do you mean making the limit a...
  11. Replies
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    Reversing axis direction in linuxcnc

    Please can someone tell me the best way to reverse the direction of an axis in Linuxcnc?

    I just realized that I accidentally built a dyslexic machine when my engraved letters came out backwards on...
  12. Re: Fly cutter surfacing plywood spindle speed and feeds

    I remember reading about balanced tools. Now I understand the significance.

    I assume your 10,000 lb router has a far larger cutting area than mine but, if I understand right, the point is that it...
  13. Re: Fly cutter surfacing plywood spindle speed and feeds

    I experienced that first hand yesterday when I turned it on at 6000 rpm for a few seconds...

    My machine is 1000lb + of Epoxy granite and is usually super quiet. It sounded like a helicopter...
  14. Re: Fly cutter surfacing plywood spindle speed and feeds

    Thanks. I've ordered a pair.

    Out of interest, is it the spindle speed that makes a fly cutter unsafe (I.e. that the carbide cutter might come loose and get launched at me) or is it the material...
  15. Re: Epoxy granite - has anyone tested for Young's modulus?

    Designing parts made using epoxy where stiffness is the key factor is what I do for a living. Your understanding of the properties of resin and what effects them is off.

    Particularly on the...
  16. Fly cutter surfacing plywood spindle speed and feeds

    What spindle speed and feeds do you guys use for surfacing a spoil-board with a fly cutter?

    I picked up these two cutters:

    https://i.postimg.cc/DSYMZCFB/WIN-20210414-10-54-29-Pro.jpg

    They...
  17. Re: Epoxy granite - has anyone tested for Young's modulus?

    Obviously machine designers need to understand if their machine is going to be stiff enough for the intended purpose. I'd just have zero confidence in using any general epoxy granite data or any...
  18. Re: Epoxy granite - has anyone tested for Young's modulus?

    What is the purpose of this?

    There's never going to be any reliable data for comparison like there is for metals because "epoxy granite" isn't a specified material. It's a composite with many...
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    Re: Mold release + EG + vibration => problems?

    I use Meguiars Mirror Glaze mold release wax plus purple PVA for any epoxy resin parts made in rigid molds (I.e. Not silicone molds).

    If done right, it's the absolute best combo I've found for...
  20. Re: How to move workpiece inside work area in linuxcnc?

    It's not so bad. I actually like the simplicity of Linuxcnc - Both in terms of not needing additional hardware and the relatively simple dashboard for the software's default frontend.

    There...
  21. Re: How to move workpiece inside work area in linuxcnc?

    I didn't know anything got stored from previous operations. That's worth remembering to avoid future headaches...

    The only issue I've had with Linuxcnc buttons and menus is when they use jargon...
  22. Re: How to move workpiece inside work area in linuxcnc?

    I figured it out. Well after rechecking the cam part like you guys said to...

    After rechecking the Cam (which was from someone else's cad file for an online tutorial) I saw they'd added a fixture...
  23. Re: How to move workpiece inside work area in linuxcnc?

    I thought I'd done both those things although I'm still learning so it's possible I did something wrong on the cam side.

    I think there is something I'm not understanding about setting the origin...
  24. How to move workpiece inside work area in linuxcnc?

    Is anyone here able to tell me how to move my workpiece or my machine zero so that it (my workpiece) is inside the work area?

    The first time I opened my gcode file everything was perfect. I.e. The...
  25. Re: Connecting Yaskawa drives to a PC for use with Linux CNCith

    I started with a cheap gas spring from Little Machine Shop and then replaced it with a set of those roll-down springs from McMaster (ones designed for continuous use). McMaster is also a good place...
  26. Re: Connecting Yaskawa drives to a PC for use with Linux CNCith

    Getting those old Yaskawa servos to work is still on my (extremely long) "to do list".

    I basically lost patience and ended up using a stepper motor / Gecko set-up. I reasoned that I'd pick up the...
  27. Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    Given the complexity in the factors that contribute towards accuracy (or inaccuracy), I doubt such a test would tell us anything conclusive. Even if everyone was cutting the same wood from the same...
  28. Re: Need simple DIY CNC machine my son and I could build?

    If the goal is to have fun and get closer to your son, I'd go with one of the simple t-slot kits.

    The learning curve and difficulty in building a diy machine from scratch can make it very...
  29. Re: How is everyone building a DIY CNC router system that maintains cutting tolerance

    "off topic" is a matter of perspective here. The thread title is a somewhat leading question in that it assumes that most people are in fact building diy machines capable of precision. My contention...
  30. Re: Running my CNC machine in a van with a portable gas generator?

    My understanding is that you'd need to derate the generator to run a cnc spindle. I.e for a 9.5a 240v spindle, get a generator capable of at least 19a.

    Also, if it is a 3 phase spindle (as most...
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