Educa's BigFoot

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Re: Educa's BigFoot

Postby educa » Mon Jan 09, 2012 5:47 pm

Is that lens then also 25mm ? or smaller?

Did you buy it from coletech ?

Regards,

Bart
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Re: Educa's BigFoot

Postby artwood_decor » Mon Jan 09, 2012 6:01 pm

Good question but I have no answer :oops:
Didn't buy it yet.
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Re: Educa's BigFoot

Postby educa » Mon Jan 09, 2012 6:35 pm

Ah OK, I am going to ask quote now and the immediately order, since I do believe the measurements of these pieces are interesting for making the frame, so it best in my opinion just to buy them :-)

Today mu 1.4m THK linear slide arrived and it is running smooth as butter.
So I now have my 2 750mm THK slides for the Y axis and 1 1400mm THK slide for the X axis.

Next step is the 35x35 and 45x90 alu extrusions and then the cnc will have work to do.

I'll also order now the 3.1Nm nema23 stepper and aluminium pulleys + T5 belt.


Life is good!
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Sketchup beginning

Postby educa » Thu Jan 12, 2012 12:18 am

Today I designed from scratch the 35x35mm aluminium extrusion profile I'll use for the machine + the 750mm thk ball bearing guide in detail.

Sketchup works nicely for this.

Results below.

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Re: Educa's BigFoot

Postby educa » Fri Jan 13, 2012 7:24 am

My x-axis stepper motor arrived today.

Man this is a beast. It has 3.1Nm of torque and I managed allready to make it rotate 10 times per second on 1/25 microstep mode.

1/25 microstep = 5000 steps per rotation. On a 20 tooth T5 pulley that'll give me 100mm of movement in 5000 steps or 0.02mm accuracy (more then enough for me). Thats 0.0007874" accuracy

At this high microstepping and relatively high stepping rate (The motor driver gets 50000Hz steps) I still have soo much torque that I burned my hand trying to hold the shaft to stop it (note to self: don't try this anymore, it hurts)

So now it's waiting for the T5 open ended belt + the pulleys to arrive and then we can continue on the mechanical part.
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Re: Educa's BigFoot

Postby vincenttor » Tue Jan 17, 2012 10:40 pm

i like this idea allot,
I wanted to make my excisting laser from FSE to a bigger format like 1200x900mm.
How are you planning to move the axis ?

something like this ?

Planning to use these rails but still thinking how and what i should do with the y axis because it looks pretty heavy moving the stepper fast with engraving.
Image
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Re: Educa's BigFoot

Postby educa » Tue Jan 17, 2012 10:58 pm

I will just use T5 belts with 20 tooth T5 aluminium pulleys on 3.1Nm Nema23 stepper motors.

My working area is theoretically about 1300 * 640 mm , but I'll limit that to around 1220 x 610 mm , thats 1/4 of an official E1 plate of material and that is also the size in which I can buy my material without having to put it in a saw to make smaller pieces.

I will also use 45x45mm aluminium extrusions instead of 20x20mm for the buildlog machine for 2 reasons.

1) I cannot buy 20x20 here, only 35x35 and 45x45

2) My machine is a lot longer then the buildlog machine, so I surely must use stronger alu extrusions.
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Re: Educa's BigFoot

Postby educa » Wed Jan 18, 2012 11:03 pm

Ok today I finished the initial design of the aluminium extrusions for my machine.



Currently I use 45x45mm extrusions and honestly I think these are a little overkill. I think I'll change to 35x35mm extrusions which are a lot cheaper and lighter and still a lot stronger then the default used 20x20 here on the buildog machine (who is smaller then mine)

I Also included a higher res picture

Image

A little detail, but the machine itself is 1600x1200mm big and the working area is around 1240 x 630 mm
The Z table will have an aproximate lift of 350mm
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Re: Educa's BigFoot

Postby educa » Mon Jan 23, 2012 12:48 am

Here is my most updated design, which will probably be the final design for the machine.

I use very strong materials and parts, but thats mainly because they are quite eqsy to mount and surely won't hurt for the strongness of the machine itself.

Video is available in full HD on youtube. Comments are more then welcome

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Re: Educa's BigFoot

Postby Greolt » Mon Jan 23, 2012 1:08 am

Just some comments. Only my ideas. Take them or leave them. ;)

How about getting the table lift belt drive below the floor of the chamber. Makes for a cleaner design and should make cleaning easier.

The space allowed for the laser tube is very large.

Smaller pulleys on the Y axis drive. You will not get useful resolution as drawn.

Greolt
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