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I’m in the market for one. How much are you asking for it?

Quick update:

It's very difficult to simulate the honeycomb core tabletop. I've been trying to figure out how I can simulate it so as to get useful results. In the meantime, here are some gantry...

I could do the same thing for the gantry, but a different bracing style would probably be more appropriate.

Here are the effects of internal diagonal bracing on a beam put under torsion,...

Okay,

I can see that the low-density XPS isn't doing a good job of transferring the strain. It is better than air, but it is not fitting the bill for what I need it to do. The best option is going...

Hey pippin,

Any chance you could link to threads for me to check out? I searched for “pippin88 epoxy” and it didn’t bring anything up.

Are you saying that this application is too small for...

Peter,

I appreciate your technical help, but your business advice is unsolicited and off topic.

Peter,

If I sub every single thing out, I will lose money every time I sell a product. Spending a bunch of money on expensive machinery, wether bought or leased, is not the way to go about...

Thanks, it will be curing in a basement and I'll have control over temperature and humidity. After it cures initially, it probably wouldn't be a bad idea to throw some heat lamps on it to help it...

If I needed to fill the gantry with PU, I guess how I would do it is mix and pour one cup at a time. Would be a little wasteful, but I could use a spatula and disposable cups to minimize waste. It...

Then I will use a torque wrench to tension all the bolts the same amount. Otherwise, the simulations seem to show that a layer of epoxy on the table, y-beams, and gantry are all relatively okay. For...

Peter,

Just to clarify, I didn't use the Remove Rigid Body Modes feature in the last simulation. The description in F360 documentation is: "At times, it is difficult to constrain a model without...

Wayne,

Thanks for relating your first hand experience. I am looking at about $2k-$2.5k for everything I need to buy right now, since I already have the spindle, motors, and electronics. I will be...

Hi Wayne,

I think I have less experience than you do.

The gantry and Y-beams will be fabricated out of 1/4" steel plate. The way I have it set up, the Y-beams and gantry can be cut from one...

Drilling Simulation


Settings

Same as last simulation, except the loads are set up in the Z axis, 1000N up into the spindle and 1000N down into the workpiece.


Deflection

Here is an update:

#1 New Gantry
I switched to a 12"x18" rectangular tube, still made out of 1/4 for now. I ran some simulations comparing the semi circle gantry to a 2:3 rectangle of the same...

Blockerra,

I understand the concept of local rigidity. I admit that I did not initially. Essentially, there is a limit to how much you can effectively expand the cross section of something while...

Peter,


PU properties for 2lb/cu ft are elastic modulus = 1500 psi and shear modulus = 380 psi. I'm sorry, the PU properties I was using were incorrect. The last simulation I posted, run with...

I'm sorry, I said you are wrong earlier, but you are correct. Even though the foam has a low compressive modulus, I think it will be okay since there is a large surface area and any load it sees will...

Blockerra,

I thanks for the feedback.

What makes my original simulation results unrealistic, besides that the Y-beams are overly constrained? It seems like there will be less room for error if...

1) The back side of the gantry does not need to be level. Yes, the front will need to be leveled with epoxy (of course, after the foam is poured into the beam).

2) All laminating epoxies, or just...

Peter,

These two simulations show that local displacement on the front of the gantry is 100x greater when resting "on air" than it is with a 2lb/cu ft density polyurethane foam core.

Mesh...

Hi Peter,

In the Bamberg thesis, he states that give the same weight and wall thickness, a square tube is -18% less rigid in bending and -38% less rigid in torsion than a round tube. However, it...

First off, great name! I love my Catahoula more than I ever thought I could love a dog.

Thermal expansion is a really good point. I will have to think about that. It is probably possible for me to...

Hi Peter,

I totally did not see these posts until now. Thanks for taking the time to respond. I guess I wasn't subscribed to notifications, but I am now.

Ideally the gantry would be a circle...

It seems like you are combining two separate potential problems:

1) Slack introduced during fabrication.
I don't see this being a problem.

2) Rigidity of the face plate in its center.
One of...

Waynekofuco, thanks for joining the thread.

I know about grblHAL. I've heard that it is not very user friendly yet since it is new. Is that correct? I only need 3 axis, but I know grblHAL has some...

Thanks everyone for the responses.



First of all, thanks for the response.

I am less concerned with chasing a specific N/um figure than I am with making a balanced machine that performs...

The steel skin and foam of the X-beam will weigh about 200 lb. With all the plates, motors, spindle, etc.. it could weigh 350 lb. So do I need bigger Y-rails? And I'm guessing I will need bigger...

Here are some preliminary simulation results. I ran these simulations before starting this thread, and I've made some small adjustments since then. I haven't had a chance to run simulations since...

Hello!

I would love to get feedback on this design that I'm working on. I'd like to order parts as soon as possible, but figured it would be a good idea to get community feedback first in order to...