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Birth of a 4-axis CNC machine #5: Bet you thought I gave up on this...

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Blog entry by DS posted 210 days ago 1161 reads 0 times favorited 12 comments Add to Favorites Watch
« Part 4: Linear Rails - WOO HOO! - eBay doesn't totally suck after all. Part 5 of Birth of a 4-axis CNC machine series Part 6: Y axis coming together... »

I decided to widen the machine when I started planning for the y axis.

I was going to have to cut down most rails anyway so I thought I’d rather have the extra capacity.
Also, while I had the entire assembly tore down, I decided to add the maple panels into the frame to rigidize the entire assembly. It has really made a big difference.

The y axis began with the guide bearings and some 2” angle.
I threaded the ends on the 80/20 rails and secured them to the angle. The plan is to add maple panels in these as well. I’ll cap these with a top maple panel and attach my horizontal rails to the front.

The gantry should be fairly rigid when fully assembled.

I’ve decided to focus more energy this year to completing this machine.
Unfortunately there is less of a budget this year than there was last year. Still, I’m gonna see this through.

UPDATE: put the gantry together last weekend… More pics to come.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251



12 comments so far

View oldnovice's profile (online now)

oldnovice

3712 posts in 2001 days


#1 posted 210 days ago

Hang in there as it doesn’t look much like a CNC at this time.

Isn’t that extruded aluminum a delight to have/work with? One of my last projects, before I got laid off/retired, was vision inspection system to inspect the laser assemblies which I built with the 1” size of T slot material including linear slides, a screened PC location, and flat screen monitor. This inspection system was moved into an optical class 1 clean room about 9 months before I left. I really fell in love with the camera I used on that system as it was fast and all parameters were accessible by the PC and the inspection state machine. OOPS got a little off topic
—————————————————————————————-
Aren’t you concerned about increasing the noise level with all that resonant plywood?

-- "I never met a board I didn't like!"

View SPalm's profile (online now)

SPalm

4791 posts in 2515 days


#2 posted 210 days ago

You are a class act DS.
The stiffeners seem like a great idea.

I forget, are you planning on belt drive?

Steve

-- -- I'm no rocket surgeon

View boxcarmarty's profile

boxcarmarty

9168 posts in 993 days


#3 posted 210 days ago

Hang in there DS, You only have 11 more months in this year…..

-- My mind is like lighting, one brilliant flash, then its gone.....

View DIYaholic's profile

DIYaholic

13324 posts in 1308 days


#4 posted 210 days ago

”...Aren’t you concerned about increasing the noise level with all that resonant plywood?”

I don’t know about resonance or harmonics….
But, I do know it LOOKS like a great idea!!!

What do you mean the budget is less.
You need to adjust your priorities….
You don’t really need three square meals a day!!!

Stay focused…
I want to see this thing in action!!!

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View helluvawreck's profile

helluvawreck

15623 posts in 1500 days


#5 posted 210 days ago

That looks like a pretty good start anyways. I hope that it goes well for you.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View stefang's profile

stefang

12945 posts in 1967 days


#6 posted 209 days ago

Wow, should be quite a machine when finished. Keep up the good work!

-- Mike, an American living in Norway.

View DS's profile

DS

2131 posts in 1053 days


#7 posted 209 days ago

Well considering my budget last year was ZERO, a little less than zero is not very encouraging.

Not worried about resonance… The maple is pb core and that stuff is fairly dead acoustically. Besides, the whine of the spindle will be about all you’ll hear anyways.

The panels are built like a glorified tgi beam, only with 80/20 aluminum instead of 2x material. I rabbited the edges of the panels to slot into the 80/20 nice and snug. When I checked it for square it was dead nuts on. 100x more rigid now.

Steve, the x axis will a rack and pinion. The jury is still out on whether a belt will be involved. I’m hoping to do a direct gear drive.
The y and z axis will be direct lead screw driven.
I have a100:1 nema34 planetary gear for the a axis.

I am hoping to have the gantry frame assembled this weekend ready for the linear rails. (Which I still need to buy)

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View oldnovice's profile (online now)

oldnovice

3712 posts in 2001 days


#8 posted 209 days ago

A ZERO budget … that sounds typical of us wood workers!

Just wanted to make sure you weren’t build a sound amplifier.
I can’t hear my spindle, all I hear is the cooling fan and when the cutter starts to work!

-- "I never met a board I didn't like!"

View DS's profile

DS

2131 posts in 1053 days


#9 posted 208 days ago

I’ve been toying with the idea of a tool changer from the beginning. The atc is a MUST HAVE in my opinion, but they are super expensive.

Lately though, I’ve seen how some diy guys have used multiple spindles to hold the other tools and not need an atc.
Non atc spindles are about a sixth of the cost of a tool changing spindle so it makes some sense, but you can’t realistically use more than about three spindles on a machine my size. Two would be more practical for me, but would limit me to a roughing tool and a detailing bit.

In my way of thinking, if someone came up with a front loaded automatic changer that could mount to a plain spindle, they could sell that puppy all day and all night. My brain won’t stop imagining how it could work… I might need to see this through.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View oldnovice's profile (online now)

oldnovice

3712 posts in 2001 days


#10 posted 207 days ago

Doug, customer #1 here if you develop an ATC for a plain spindle!

-- "I never met a board I didn't like!"

View DIYaholic's profile

DIYaholic

13324 posts in 1308 days


#11 posted 207 days ago

Doug,
I’ll invest $10.00 in the startup!
Now go get to work, Partner!!!

& NO!!! I won’t be a silent partner!!!

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

View DS's profile

DS

2131 posts in 1053 days


#12 posted 202 days ago

This project is gaining momentum. Got some unexpected fundage this week. Can buy lots of hardware.
Not enough to finish yet, but a good amount of progress.

Randy, ten bucks is ten bucks. Thanks for your support.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

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