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Type: Posts; User: peteeng

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  1. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF soon - 1.5" is 38mm quite sturdy but the top of the saddle is a cantilever. If you can add some flanges to the sides this will help. The same rigidity thickness in steel is 22mm 7/8" so a 1"...
  2. Re: Working On A New "Timber Frame" Design and Build.

    Hi Loren - You sure your not building a pool table? Their easier then CNCs. Peter
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    Re: Design & Build of Frankenrouter

    Hi All - I think I'll call the machine Ockah rather than FinMaker. FinMaker is a bit specific if it ends up being a production machine. I sent out a RFQ to BST for the motion parts today and start...
  4. Re: CNC Gantry Build. The $1 mistake that started it all.

    Looking good but now you are at the point of adding drives and this will mess with your clean design!! I have always liked the Mori designs very classy I think... Peter

    edit - is your saddle...
  5. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - The foundation of the rail is very important so double the thickness of the rail foundation plates and include the machining allowance. But you can back the other thicknesses off. I'd also...
  6. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - Here's an article that discusses movement after stress relief. Peter
  7. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - That design has a few issues. As you say you need a large heat treaters to SR the frame but also the load path from the tool to the job is thru the frame and thru many elements of the frame....
  8. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - all those bits have to be lined up and the welding will be a variable. I'd try to make the "side legs" as a single piece vs so may bits. But you are SR and final machining so that would...
  9. Re: Working On A New "Timber Frame" Design and Build.

    Hi Loren - I've found pocket hole screwing allows alignment of parts vs end screwing which makes that impossible. Plus they pull up very tight. Its now officially looking like a machine! :) Peter
  10. Re: CNC Gantry Build. The $1 mistake that started it all.

    HI CBF _ 1/8" OK. Does your CAD have FE? If so do a modal analysis and this will show you how the frame will vibrate and at what freqs. If you publish the stand step file I can run the modal if you...
  11. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi GBF - stand non treated OK. Will need a few more cross braces I think. Cantilevers are like tuning forks and can vibrate easily. Peter
  12. Re: Can linear encoders be combined with digital step drives?

    Hi Roger- MM may have a very big machine which kills the ballscrew idea. MM how big/small is your machine? If its small enough to use ballscrews then that's a very good solution. Ballscrews are...
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    Re: Milli a new composite mill kit

    Hi All and Sundry - I've spent a little time on Milli today checking the Z axis travel and adding some holes for wires and adding a face sheet for an apron. The spindle does not come fwd enough...
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    Re: Milli a new composite mill kit

    Hi Ard - The issue is that milling steel 5000rpm plus is usually too fast. Unless someone wants to correct me on that. Ideally a single unit is good (ie no gearboxes/pulleys) to keep it as simple as...
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    Re: Milli a new composite mill kit

    Hi - yes it seems the equivalent servo is more powerful at similar or less cost then you can do tapping with it. Ideally I have been looking for 6000rpm motor... So an AC servo with 1:2 belt seems...
  16. Re: Reasonably Rigid Router (RRR) - a cautionary tale (likely) in the making.

    Hi All - I think TSR on pressure vessels is to improve the fatigue resistance of the welds. There must have been some work done on this to establish a thickness threshold. In some of the projects...
  17. Re: Can linear encoders be combined with digital step drives?

    Hi MM - This is positional control and you do have to consider acceleration and jerk to make a system run really smoothly. The spring in a belt is caused by high accelerations or/and an undersized...
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    Re: Wood CNC advice

    Hi Mr2 - 1) I think that depends on where you are on the planet. Where are you? 2) do you want to build a machine or buy one full functional? Peter
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    Re: Design & Build of Frankenrouter

    Evening All - Been working through FinMaker adjusting rail lengths, putting in screw holes. Making sure screws have top clearance and access etc. Now to check the top and bottom height of the Z axis...
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    Re: Designing a new router called Brevis-HD

    Hi All- a last job of the day. My father makes "paper people" for a hobby and this ones feet fell off today when I took it out of its box. So I made some new ones. Off to dad for him to paint. Peter
  21. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - The deflection due to stress relief is hard to predict. Lets say that it will deflect enough that the linear rails will not function they will jam if you machine them first. I had 2 saddles...
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    Re: Designing a new router called Brevis-HD

    Hi all - Scoots job today was to clean up an inlay I did for the Mens shed. A small cutting board with a jarrah knife inlay. Unfortunately the handle is on a dark vein. But oiling will bring it out....
  23. Re: Reasonably Rigid Router (RRR) - a cautionary tale (likely) in the making.

    Hi CBF - I don't think there is any ratio for the steel to not to move. I've worked on very small welded parts (ultrasonic devices) and very huge mining equipment (trailers that cart 650 tonne trucks...
  24. Re: Working On A New "Timber Frame" Design and Build.

    Hi Loren - yep everything is a compromise I suppose that's why we don't stop at one machine... :) Peter
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    Re: Haas mini-mill FEA

    Hi Jag - Thks for the MR-1 info. Good info as I'm nearly going down that path but my machine will be much stiffer. Peter
  26. Re: CNC Gantry Build. The $1 mistake that started it all.

    Hi CBF - Looking good. 25mm cars is a good size get medium or high preload cars not nominal cars. The top of the columns can be thinner. The max moment is at the cars so having such a wide top does...
  27. Re: Working On A New "Timber Frame" Design and Build.

    Hi Loren - Some ideas - did a quick calculation on your gantry. 1) I recommend making it solid plywood no internal bits this would weigh 25kg/m 2) if you make the same size al gantry it would be...
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    Re: Design & Build of Frankenrouter

    Hi Mactec - Thks for the thought. Its easy to use a 24k spindle but its too fast for many steel jobs. I do see that many people are using high speed spindles in steel these days perhaps its just...
  29. Re: Working On A New "Timber Frame" Design and Build.

    Hi Loren,
    The next machine has a foot print of 1200x1200mm. Its that size as that's the std sheet width. Look up the Frankenrouter thread. ...
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    Re: Milli a new composite mill kit

    Evening all - I think I've found a candidate for Milli's spindle. In another project I'm building a router with a 1200x1200mm footprint. I'm thinking of the next build to make a mould and vacuum cast...
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