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If you insist on "good" working model, (in other words not Chinese) ...make that 10%.

Never would have thought I'd read that here....disappointing. I got into CNC 20 years ago too and I would never ever EVER buy a working machine which I know I could build for 20% of the price. Thing...

Feel free to use sizes up to about 45mm if you think it helps. Particularly if you avoid the smaller particles it might be useful to be able to extend the upper range. I can easily make sieves any...

Cameron,

Do you think it's possible to achieve higher packing densities than with the agsco grades? If so, do you have any suggestions on a mix I might try with my grades?

I have woven wire...

If anyone is interested in tryin the JMicroVision software, I had a hard time figuring out some of the basics so I thought it might be useful to have a step by step to get up and running;



...

John,


Thanks for posting this. I highly recommend trying it out, it's very easy to use. Take a photo of your aggregate sprinkled on a contrasting colored background, import it, play with a few...

John,

Great question, exactly what I've been wondering too.
For a simple open box type mold where the part is cast upside down, Im thinking of making the walls about 30mm taller than the part...

This small sample was a preliminary test to try out vibration under vacuum to see if it is worth further testing. My quartz is just 6mm down to dust straight from the quarry, unsized and therefore as...

You weren't kidding I see! :D



RomanLini,

Couldn't agree more regarding the practical nature of this process. Then again, I don't have a choice. If I were as talented and dedicated as...

That's my point, Thomas's formula as I understand was not considered to be optimal, but he has a machine. I wonder how his machines go with substantial cuts in steel.

Are we satisfied with the material that the big guys are using? The way I see it now we have already achieved perhaps better packing than them and have available the same epoxy/additives. We don't...

After casually following this thread from day one, I've gone back and re-read every post. Very interesting to read 4 years worth in 6 days!

Ok,

It seems the very fine aggregates are causing...

Can anyone help out with a supplier for these quartz products. I've been doing some testing and I'd like now to try this formula. It is next to impossible to find things local here in Australia and...

Say you take 2 identical containers and fill one to the top with your dry mixed aggregate and the other with freshly mixed wet EG(say at 15% epoxy). Both containers are then vibrated continuously at...

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pfred2,
So what procedure DO you use to weld a gas tank?

This is how I will do mine,

Measure the cylinder and mathmatically calculate the internal volume.
Fill it with water.
Empty that water into a container and measure volume.
Smell the water and...

Is there an advantage to use the PMDX-132 over the PMDX-125 for G203 drivers on a mill? I see the 132 is designed specifically to mate directly with the gecko drives which is nice but I think the 125...

Yes I am familiar with lost wax/investment casting. The issue Im concerned with is the molten metals ability to to conform to the detail of the mold under gravity only. I think it's surface tension...

Hello,
I am casting hand impressions of a 2 month old baby. I am getting life-like replicas with epoxy and rtv's from alginate molds but I'd really like to use metal. What metal (precious metals...

Richard, your method is better yet as it maximises contact surface between the drive and the cable. I have seen it used often to drive the larger automated reflecting telescopes.
What's also nice...

I believe when implemented correctly either of these two methods can practically eliminate backlash and be DIY'd for less than $50 per axis.

I like the idea of direct drive most, shown here as...

Yes that particular one is too slow. It's more the concept of using a hydraulic spindle that Im interested in. Havn't looked around for an off the shelf unit too much as I think I will DIY one. Just...

Thinking of ways to reduce weight off the gantry I thought a small hydraulic motor could be used as a spindle. A quick search found one such as this: http://www.anchorlamina.com/p_hydrmotors.html ...

Thanks Argo,
but thats all to to with software/firmware. I need info on pin descriptions first. Most are self explanitory however some are not, ie- each axis has +5v and a GND. Are they inputs or...

Im trying to wire it up but not sure what some of the pins are. I have checked on the support page at geckdrive. I recieved no documentation with it or the 203V's I purchased. :confused:

Thanks.