Steep Creek Fab 4'x5' build

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J0nesy
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Steep Creek Fab 4'x5' build

Post by J0nesy » Fri Nov 20, 2020 9:01 am

Wanted to share my build with the experts here and get some feedback and advice. Might take several posts to get up to current progress.

Started off with drawing the design up in Solidworks.
3d pic 1.JPG

When I started the project and design, I was working for a large international CNC machine tool company. So they tossed out obsolete, used, or damaged parts frequently. That is how I acquired the aluminum extrusion, linear guides, and cable energy chains. The linear guide length is what determined the overall stroke of my machine. 48"x66" should be large enough to do anything I really need.

Overall this has been a slow moving project. I've tinkered with it on and off over the years as life gets in the way, marriage, moving, new job, etc. But since I've been working from home, it has become one of my Covid projects to get it fired up.

Specs:
48 x 66 inch working area
Dual 300 oz-in nema 23 motors on the gantry (Y axis)
Single 300 oz-in nema 23 motor on carriage (X axis)
Single 156 oz-in nema 23 on the Z axis
CNC4Newbie Z axis assembly
Floating z axis with micro switch
4" deep water table
2"x1/8" flat stock used for curved slats
#35 chain drive on X and Y axis'
10 tooth sprockets
Price THC
Hypertherm 45xp

Mach 3
Sheetcam
Solidworks

Current state of the machine
20201117_190056.jpg

I've been able to make some cuts with the machine. Simple shapes haven't been an issue. But of course the first complex sign I was asked to do for a friend has been kicking my butt.

Known issues or work left to do:
Upgrade Y axis motors to 425 oz-in motors ???
Swap over to Belt or rack and pinion on X and Y ???
Trim some weight off Gantry
Add tensioner to X axis chain
Dial in motor tuning (was just reading up on the topic this morning)
Do test cuts to determine best cut feed rate for my materials
Do test cuts to determine best THC voltage for my materials
Can't get fine cut consumable to hold an arc

These are supposed to be 3/8" diameter holes
20201117_185838.jpg
Rough looking cuts
20201117_164053.jpg

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acourtjester
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Re: Steep Creek Fab 4'x5' build

Post by acourtjester » Fri Nov 20, 2020 9:19 am

2 things Hypertherm as already done a chart got cutting spects do a search here on the fine cut nozzle for info on those.
Here is a video showing setting up the Price THC, other info posted in your other post (viewtopic.php?f=147&t=31429)

DIY 4X4 Plasma/Router Table
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J0nesy
Posts: 6
Joined: Thu Nov 05, 2020 11:05 am

Re: Steep Creek Fab 4'x5' build

Post by J0nesy » Fri Nov 20, 2020 10:07 am

acourtjester wrote:
Fri Nov 20, 2020 9:19 am
2 things Hypertherm as already done a chart got cutting spects do a search here on the fine cut nozzle for info on those.
Here is a video showing setting up the Price THC, other info posted in your other post (viewtopic.php?f=147&t=31429)

Thanks for the Price setup vid. I was struggling to figure out the best method to dial that in for each material.

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acourtjester
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Re: Steep Creek Fab 4'x5' build

Post by acourtjester » Fri Nov 20, 2020 11:21 am

You can do this for each metal thickness you normally cut but with the thinner metal use a weight on top of the metal to be sure it is flat for the testing. And cut away from previous cuts so the metal does not warp up and give you a false clearance readings. It becomes quicker as you see it function each test.
have fun
Tom
DIY 4X4 Plasma/Router Table
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PowerTig 255 EXT

adbuch
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Re: Steep Creek Fab 4'x5' build

Post by adbuch » Fri Nov 20, 2020 8:36 pm

I use the settings from the Hypertherm chart for Low Speed FineCut Mild Steel. They work well for me.
David
Low Speed FineCut Mild Steel.jpg

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adbuch
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Re: Steep Creek Fab 4'x5' build

Post by adbuch » Sat Nov 21, 2020 8:44 pm

J0nesy wrote:
Fri Nov 20, 2020 9:01 am
I've been able to make some cuts with the machine. Simple shapes haven't been an issue. But of course the first complex sign I was asked to do for a friend has been kicking my butt.
Your holes look oval shaped. I would suggest attaching a sharpie to your torch mount (instead of cutting) and letting your machine draw your holes and letters to see what they look like. This may help you separate any mechanical issues from plasma cutter issues. If your letters still look wavy and your holes out of round when the machine draws them, then you know you have one or more mechanical issues.
David

adbuch
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Re: Steep Creek Fab 4'x5' build

Post by adbuch » Sun Nov 22, 2020 12:50 am

Here is a pen holder that looks easy to make.
David

https://www.youtube.com/watch?v=zPDTyza ... e=youtu.be
Pen holder video.jpg

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J0nesy
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Joined: Thu Nov 05, 2020 11:05 am

Re: Steep Creek Fab 4'x5' build

Post by J0nesy » Tue Nov 24, 2020 2:23 pm

I upgraded both gantry (Y axis) motors from the 300 oz-in motors to some 425 oz-in motors. This does seem to help with the sluggish motion I'm seeing. Now that I've bumped up the acceleration I need to do some bracing on the table legs, and trim some weight off the gantry assembly.

Also was able to take a look at some of the parameters in a turn key system that a local business has, and might play with some of the settings in sheet cam and mach 3 based on what I seen there.

I'll for sure try putting a pen on the torch to try and narrow down the issue.

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acourtjester
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Re: Steep Creek Fab 4'x5' build

Post by acourtjester » Tue Nov 24, 2020 4:51 pm

When tuning the axis motors I use a rule of thumb where velocity will be like 100 and acceleration is like 25, or a 4 to 1 ration. If the acceleration is to high the motor will stall when it tries to move.
DIY 4X4 Plasma/Router Table
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PowerTig 255 EXT

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