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 823 reads 0 times favorited 8 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

8 comments so far

View eddie's profile


7392 posts in 1301 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


13270 posts in 2021 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


14855 posts in 1491 days

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

Some serious engineering ventures here.

-- Roger from KY. Work/Play/Travel Safe.

View helluvawreck's profile


15959 posts in 1553 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

-- 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 DIYaholic's profile


13763 posts in 1362 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 procratination a bad thing?

View JL7's profile


7271 posts in 1652 days

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

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

-- Jeff - I have not failed. I've just found 10,002 ways that won't work.

View DS's profile


2131 posts in 1107 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


38 posts in 1635 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.

-- Really? Really? How important is it?

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