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Type: Posts; User: peteeng

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  1. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Obivan and others out there - To pursue the issue of wetting the "granite" and creating a dense structure. Adam Bender...
  2. Re: Ideas on Approach to milling particular part

    Hi TJB - I'm not a machinist either but it sounds like you need to do the following:
    1) Set up the bars and end drill them with centres. The trick here is to correctly register the centres. You may...
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    Re: Large Epoxy granite VMC building

    Hi Vak - Although the epoxy requires 16hrs at 60degC with the thick casting and mass you have its unlikely the middle of your parts will get to 60C in 16hrs? Maybe go for 24hrs, have you spoken to...
  4. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Obvian - I looked up the polylite viscosity its 120MPas so is really low if you can get it. I've attached an image of some tooling board I used to make for a customer. Its glass microspheres and...
  5. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Obvian - both of these systems use diluents to reduce the viscosity. Diluents generally reduce physical properties and also the resin shrinks as some of the diluent desorbs from the resin over...
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    Re: Designing new Router called Maximus

    Hello All out there - Been learning Inventor and it has a topology optimiser. Had a play with the mill column. Peter
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    Re: Building my first CNC - final questions

    Hello Nej -The motor supplier will have a voltage torque speed chart to answer your main question. But the difference at the higher voltages is not much at low speed more at high speed. but the chart...
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    Re: Timing Belt Opinions

    Hi Hopeless - I personally would not worry about the height, your gantry rail spacing is very big, it will cope easily unless you are aiming at 1G plus moves? . You are using rails for the Z yet...
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    Re: Designing new Router called Maximus

    Hi All and Sundry - So I'm cranking up Maximus again. Getting the dwg stack ready for the new supplier and I've drawn up my first Tetrium part. The rear column. I'll have to do some side by side runs...
  10. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Britt - My diagram shows that a single size can achieve 91% pack by volume with a single size particle, hard to expect to get better. If you say the "large" particle has a diameter of 1 then the...
  11. Re: Epoxy-Granite machine bases (was Polymer concrete frame?)

    Hi Guys - I'm very interested in this epoxy granite stuff. But I'm perplexed why we need to use a mixture of sizes if small spherical particles are available. If they are round (any size) they will...
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    Re: To buy vacuum table and pump Toronto?

    Hi kievari - You can make your own vac table there are lots of plans and ho to around. What do0 you want to hold, objects, small parts or sheets? Peter
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    Re: Question which is the best ?

    If your looking for open software with CAM try Freecad. Will always be free. But there is no Best. I use Rhino3D, Alibre, Mechsoft CAM and now learning Inventor. Depends on what your company uses,...
  14. Thread: Cnc stl

    by peteeng
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    Re: Cnc stl

    Also try Freecad has a good CAm module. I have mecsoft CAM and the freemill in it is good. Peter
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    Re: Fusion 360 subscription changes

    Hi All- The Fusion 360 free offer has been a longstanding hook and it had to change to a cost sometime. All of the Autodesk software is now subscription based, can't get a perpetual license. So the...
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    Re: Designing new Router called Maximus

    Hi Pippin - agreed, gaining some room for the ball nut is always an issue. Hadn't thought about it that way before maybe I'll do that on the mill. Thanks Peter
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    Re: Designing new Router called Maximus

    Hi Pippin 30mm cars are big? Is your machine big? 30mm flanged PMI brand cars are rated at Co=57.8kN or 5.9 tonne. The normals are same. 20mm are 29.5kN which is 3T. Regards Peter
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    Re: Timing Belt Opinions

    Hi Hopeful - 9mm is too narrow. Needs to be at least 16mm wide depending on the stiffness required. I'd use the widest pulley you can put on the motor shaft. My router has 16mm wide belts on all axis...
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    Re: Designing new Router called Maximus

    Hi Pippin - The flanged bearings usually have a greater load rating then the normal ones (edit - seems this depends on brand) . I use flanged as they have bigger bolts (stiffer) and a bigger platform...
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    Re: Designing new Router called Maximus

    Hi Pippin - If you place the flanged bearings on top of each other there's not much space for bolts plus you have to use a small bolt, plus you can't check bolt torque in service without breaking the...
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    Re: Designing new Router called Maximus

    Hi All - Made a quick dummy model to simulate the bearing loads. The Co of the 20mm car is 2426kgf. The Bamburg document uses 500kgf for the tool load so shall I. The worst loaded bearings are the...
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    Re: Designing new Router called Maximus

    Hi All - Had a meeting with another sheetmetal company today. Mainly to check that my bending details where the same for their machines tooling. Otherwise I'll have to rework the parts!! I've had...
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    Re: Designing new Router called Maximus

    Hi Pippin - I spent a bit of time understanding the saddle function in Maximus. Turns out saddles are redundant structural loops and exist for convenience vs function. In Maximus I have spilt the...
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    Re: Designing new Router called Maximus

    Ericks - Like this one except metal and tidied up? Peter
    https://www.youtube.com/watch?time_continue=37&v=OIlNAUVZZaM
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    Re: Designing new Router called Maximus

    Hi Pippin - Measuring the dampness of a material can be done in many ways so there is experimental error to consider. For instance in the paper you attached they did a modal analysis and compared it...
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