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Type: Posts; User: peteeng

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    Re: Milli a new composite mill kit

    Hi Ard - I wouldn't use a steel filler. I'd use a structural putty. The granite surfaces have to be roughened not polished. Typically sandblasted but an orbital sander to roughen would be OK. Epoxy...
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    Re: My CNC Router Build Adventure

    Hi All - I have briefly looked at the video on FEA and the concept of stress flow is incorrect. Stress does not start somewhere and flow like a river to somewhere else in a structure. It has been...
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    Re: Milli a new composite mill kit

    Hi Strawb - I've watched some of his vids. Very good, but he does not discuss the control side of things. I may have to send him a note. Peter

    edit - I downloaded the MG10HL cad model very nice.
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    Re: Milli a new composite mill kit

    Hi All - Its been on my list for some time to design a robot like machine. Perhaps Milli-IRB should be it. The issue is writing the Jacobian for the co-ordinate kinematics. It may exist I'll have a...
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    Re: My CNC Router Build Adventure

    Hi Jayne - I'd have to model the two, to figure which is better. But my guess is webs win. But choose which you like for now, you have bigger fish to catch. Yes good observation on the cars. I...
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    Re: My CNC Router Build Adventure

    Hi Jayne - to have the bolts in the same plane is ideal as then the loadpath is straighter. But this means the holes have to be further out from the corner so the bracket has to be thicker to...
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    Re: My CNC Router Build Adventure

    Hi Jayne - lovely brackets. The bolts need to be as close the ends of the webs as possible and as close to the corners as possible. Ensure it can be assembled, crossed bolts can be tricky. Maybe have...
  8. Re: Granite horizontal 5 axis build inspired by Grob/Kern

    Hi Asah - The trunnion face will need to be thicker similiar to the base... the steel frame will not match the stiffness of the granite slabs. The machine will only be as stiff as its most compliant...
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    Re: My CNC Router Build Adventure

    Hi All - I built a model of Jaynes wall. One is welded the other is bolted. Its steel but if aluminium the answer is the same just more deflection. I used M10 C8.8 bolts to hold it together preloaded...
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    Re: Milli a new composite mill kit

    Evening All - I think I'll convert Milli to one of these.

    https://robotics.kawasaki.com/en1/products/robots/extra-large-payloads/MG15HL/index.html?language_id=4

    1.5T capacity at 4m reach !! ...
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    Re: Design & Build of Frankenrouter

    Yes Buoyen - I do. Sounds like a marriage.. Peter
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    Re: My CNC Router Build Adventure

    Hi Mactec - The circled bolts are structural they hold the main elements together, hardly "no function". At some level every machine is held together with bolts. If holding rails on with bolts is...
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    Re: My CNC Router Build Adventure

    Hi Jayne - use deep engaged threads a full tap depth. That will be strong enough. Plus use long bolts so its stiff in local bending. helicoils are great for repair but they will drive you mad doing...
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    Re: My CNC Router Build Adventure

    Hi All - I do like the asthetics of hot rivets - Wallace and Gromit esky (esque) .. Peter

    Machine parts are blunt instruments when it comes to structure, not much elegance to them. Welding is used...
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    Re: My CNC Router Build Adventure

    Hi Andrew - If your good with oxy/acytyelene brazing Al is very good method. An aluminium brazing alloy is used not brass. Typically 4047 a high silicon alloy. Its very good for joining thick to...
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    Re: My CNC Router Build Adventure

    Hi Jayne - If bolted then use the angles from the construction aluminium systems and profiled plates as needed. Edge bolting has issues, they have to be square and flat. Best achieved on a mill. But...
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    Re: My CNC Router Build Adventure

    Hi Jayne - so you are going to weld the aluminium? If its thick 12mm plus then you can edge bolt it and glue it with same glue.... a 12mm fillet each side and its a very strong joint.... Peter
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    Poll: Re: belts vs screws?

    Hi Rama - I have just finished my latest machine yesterday. Shaking it down now for dust extraction... Peter

    https://fb.watch/86KtxbwUUi/
  19. Re: Converting Torque rating, looking for a coupler

    Hi 570oz.in is 35.6lb.in so the 8in.lb is really underdone. They will also quote a failure load or Safety Factor which is usually x2. So you are going to need the 44's or more... Peter
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    Re: Design & Build of Frankenrouter

    Evening All - I've decide to stay with the 2400mm total overall length and optimise around a sheet size. So it will be 2400mm length and 700-750mm deep. Will do some more work on the model now YaG is...
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    Re: My CNC Router Build Adventure

    Hi Jayne - I think your wall design is a bity complex and combines the wrong elements. Think of how your planes are built. Would Boeing, Cessna or others weld RHS together and have bits sticking out...
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    Re: My CNC Router Build Adventure

    Hi Jayne - two N23 with a 10mm pitch is the go. 5mm will give you very large force but low velocity. I haven't tuned YaG yet but its getting 6000mm/min rapids at half current (16mmx10mm lead...
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    Re: Designing a new router called Brevis-HD

    Hi Strawb - When I started in the industry hearing protection was not "in" and most machinists were deaf. ALWAYS wear ear protection when machinery is on. Once ears are damaged they never recover and...
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    Re: My CNC Router Build Adventure

    Morning Jayne,
    Some gantries are 100's of kg depends on how stiff you need. 125x125x3 is about the same stiffness as YaG so it will be quite stiff. But you have mounted the rails directly to the...
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    Re: Designing a new router called Brevis-HD

    Hi Strawb - some pro, some some amateur, but thanks for the praise. Viewers turn your sound down! Here's YaGs first cut. The ply had a small bounce in it, needed better hold down.... will need to...
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    Re: My CNC Router Build Adventure

    Hi Jayne -

    Machine controller (MACH , UCCNC etc) talks to the motion controller (in this case a UC100) , the BOB (break out board) breaks out all the signals to the other components including...
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    Re: Designing a new router called Brevis-HD

    Thks Jayne - Hi All - I'm off to make some sawdust but I don't have any M8 hold down fixtures. I sold them all on my last machine.... but I'll figure something out for the occassion. Will take...
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    Re: My CNC Router Build Adventure

    Hi Jayne - Think of them as parameters vs solutions. For instance Brevis is my small belt driven router and it can run 15m/min velocity and 1000mm/s/s acceleration. YaG I've cut down to 5000mm/min...
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    Re: Designing a new router called Brevis-HD

    Birth Announcement - Today at 11:32am Australian EST YaG moved under program control in correct calibration. Birthname YaG800, Creator - Peter, Place of Birth Dum Dum NSW, Birthweight 178kg, length...
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    Re: Designing a new router called Brevis-HD

    Morning all - I have started thinking about the homing switches. To the more experienced on these out there can UCCNC home two sides of the gantry or just one? I know Mach does both and playing with...
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