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Birth of a 4-axis CNC machine #12: X axis build (again)

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Blog entry by DS posted 06-23-2014 04:47 AM 2775 reads 0 times favorited 13 comments Add to Favorites Watch
« Part 11: Z-Axis comes together Part 12 of Birth of a 4-axis CNC machine series no next part

I put off assembling the x axis rack and pinion until I was able to purchase the rest of the parts. The y and z axis has to build on the x axis. I bought the linear rails a long time ago, so the y and z were built on top of this.

Well, now that I am ready to finish the x axis, I had to remove the y and z from the gantry.

The pinion gear assembly took a bit of work but they are finally ready.

Due to the depth of the pinion gear and the mounted flanged bearing, I had to build out the ends to get the correct spacing.

I debated about banding the edges first or fitting everything then banding.
When push comes to shove, I wasn’t certain I wouldn’t be remaking these ends more than once. So, no banding yet.

I figured out I will need a tensioning bearing in the middle of the timing belt to reduce backlash.
I have some left over bearings from the pool pump motor rebuild. (It was cheaper to buy.ten than to buy the six I needed)

This should be a fairly simple proposition, but I ran out of weekend before I got it finished.

I got the x axis stepper motor mounted and the main drive rod installed on one end. (It’s a double ended motor shaft)

The 10mm drive rod turned out to be short by the time I cut off enough for the pinion gears. I didn’t count on having to space it so far out either. I have a 5/8” diameter rod that I’ve drilled a socket in the end and tapped set screws from the sides. As long as I can get it mounted straight, it should serve nicely.

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



13 comments so far

View eddie's profile

eddie

8565 posts in 3007 days


#1 posted 06-23-2014 07:43 AM

DS its starting to take shape ,cant wait to see it in action

-- Jesus Is Alright with me

View stefang's profile

stefang

16705 posts in 3727 days


#2 posted 06-23-2014 09:41 AM

This is going to be an amazing tool when finished.

-- Mike, an American living in Norway.

View Roger's profile

Roger

21006 posts in 3197 days


#3 posted 06-23-2014 11:23 AM

Some serious engineering ventures here.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

View helluvawreck's profile

helluvawreck

32086 posts in 3259 days


#4 posted 06-23-2014 12:39 PM

After you get it finished this will make a great addition to your shop so please keep us posted as work progresses.

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

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

View DIYaholic's profile

DIYaholic

19799 posts in 3068 days


#5 posted 06-23-2014 10:39 PM

It is great to see your progress!
Looking forward to more….
REALLY…. anxiously awaiting a video of chips flying!!!

Carry on….

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

View JL7's profile

JL7

8738 posts in 3358 days


#6 posted 06-23-2014 10:44 PM

Nice to see the progress DS…....keep pluggin’ away!

-- Jeff .... Minnesota, USA

View DS's profile

DS

3166 posts in 2813 days


#7 posted 06-24-2014 09:27 AM

Thanks for all of your encouraging comments. There is still a long way to go it seems.

With the summer heat, it makes working in the garage a little unbearable at the peak of the day.

My folks were just in Park City, Utah last week and got snowed on – in June!

It was 108 degrees in Phoenix today.
185 degrees on my cars steering wheel… Ouch!

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

View PatrickB's profile

PatrickB

53 posts in 3341 days


#8 posted 09-15-2014 12:04 AM

Good luck with the build, any man willing to sell his truck to make it happen is a man on a mission.
Pat

-- Really? Really? How important is it?

View DS's profile

DS

3166 posts in 2813 days


#9 posted 11-02-2014 10:48 PM

The last few months I’ve been focused on getting the controller finished. Unfortunately it feels like the build stalled out. The learning curve with C# and the .net micro framework was just taking me way too long.

After some contemplation, I decided to do what I was previously determined not to do – buy a pc and a copy of mach 3.
Within 24 hours of installing mach 3 on the new pc, I was moving motors with my mouse – a very exciting moment!

The build is back on track. By the end of this week I will have the parts I need to button up the x y and z axis’ under nc control.

Then, it will be on to the tool carousel, the spindle and the a axis
When I install the controller in the box, I’ll update the blog with progress pics.

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

View DIYaholic's profile

DIYaholic

19799 posts in 3068 days


#10 posted 11-03-2014 03:54 AM

DS,
Glad to see this update….
I was worried about you.
OK, I was more worried about the CNC not getting built!!!

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

View Joe Lyddon's profile

Joe Lyddon

10614 posts in 4445 days


#11 posted 05-23-2019 06:54 PM

DS,

I guess you finally finished your CNC… did you post it on another thread?

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: https://www.ncwoodworker.net/forums/index.php

View DS's profile

DS

3166 posts in 2813 days


#12 posted 05-23-2019 09:11 PM

Well, Joe, I wish I could say the machine is finished… but it’s not.
I did button up the x, y and z axis and I performed a preliminary test of all the axis’.

There are some tweeks I need to do because the x axis torque is high and the gantry inertia is also high and the pinon gears want to skip if the acceleration is too high. (the pinion gears are spring loaded to maintain tension and minimize backlash)

It was about that time that I had a whole bunch of “life happens” stuff and the project got mothballed again.
Nowadays, I am getting my CNC fix at work on a really big machine and I’m not feeling much pressure to finish this one. HOWEVER, I do want to finish it.

I’ve pretty much decided to rebuild my gantry to lighten it up to lower the inertia. And, I am considering buying the geared-down pre-made pinion assembly instead of the “roll-your-own direct-drive one that I built. Both of these changes will address the pinion gear skipping that is happening on the x axis. Also, I can tune the Acc/Dec in software to ramp up to speed slower, although, I am about a strong and quick machine wherever possible.

The only issue now is as things always are; Time and money – need more… of both!
Thanks for your interest, Joe.

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

View DS's profile

DS

3166 posts in 2813 days


#13 posted 06-21-2019 04:57 AM

So, recently, I’ve been trying to renew my interest in completing this machine. It’s been sitting for nearly five years now. It’s hard to believe it has been that long.

I nearly resigned myself to the idea of not having the atc spindle.
That is, until I saw this guy.

The main difference between this and the rest of the 3hp 2200 Watt spindles is that this one has ISO-30 tool holders that can take an ER32 collet.

These are some pro-level specs in a power rating you can run on 220V 1ph electricity that you have around your house. I’ve never seen that before.

Now, just to get myself motivated to go out to the 110 degree garage and tear into it again. (Yes, I want to rebuild the gantry a third time) Bigger, better, faster than before. (Cue $6M man theme song)

-- "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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