Making a spindle square

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danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Making a spindle square

Post by danimal » Mon Mar 24, 2014 5:06 pm

I decided to make a spindle square to verify my new bed-plates (thanks Misumi!) were square. It made all the difference and was really cheap and easy to make. I did not get the best dial indicator in the world, but it seems to work well and is accurate enough for my needs. I designed mine with a 1/4" precision ground rod because I have the makita RT 0701C, but you could make it with a 1/8" rod if you make the piece short enough to prevent any bending when loaded. I milled the connecting arm out of .25 aluminum. Then I used some of the M5 x 10 bolts that came with the shapeoko to secure both the dial and the rod into the aluminum. I will take some pictures of it one of these days.

Here is the basic design:

Image


I mounted this into my spindle and rotated it at all four corners of my machine work area to verify that they were the same.Then I adjusted the spindle and base plate height until it was the same across the entire work surface. I was also able to use it to verify z axis backlash and movement accuracy. It was a pain to make all the adjustments, and as soon as you did one, you had to redo the rest to get it working. The best way that I found was to use machine programmed movements to all four corners and adjusted them to the same value on the dial. Then I did rotations at various points in the work area to verify the spindle was mounted squarely to the work area.

Here are the parts that I bought from amazon:
http://www.amazon.com/dp/B0050RJBBW/ref=biss_dp_t_asn
http://www.amazon.com/dp/B0050RJAPO/ref=biss_dp_t_asn
http://www.amazon.com/T%C3%9CRLEN-DIAL- ... B0043F779K

There are various spindle squares available, but most of them were really expensive and too tall to fit under my machine. This solved both problems and I think I have about $35 total into it.
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

twforeman
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Location: Minneapolis, MN
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Re: Making a spindle square

Post by twforeman » Mon Mar 24, 2014 5:18 pm

Nice. I may have to copy this.
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RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Making a spindle square

Post by RobCee » Mon Mar 24, 2014 5:29 pm

Nice work there danimal!
I have a fancy spindle square for my big mill, but it's too big to use on the SO2, so something like this is just the ticket.

You can't beat this sort of method for getting your spindle square to the wasteboard - the longer the offset, the finer the adjustment too.
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

Claudio
Posts: 26
Joined: Wed Nov 13, 2013 12:48 pm

Re: Making a spindle square

Post by Claudio » Wed Mar 26, 2014 11:16 am

Nice idea danimal!

I just made my version of the spindle square. I made the connecting arm out of plywood and used a broken endmill as the shaft.
IMG_20140326_120508.jpg
IMG_20140326_120508.jpg (96.82 KiB) Viewed 6526 times

danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Re: Making a spindle square

Post by danimal » Thu Mar 27, 2014 10:19 pm

Claudio, that looks great! The dial that I bought is not nearly as accurate as yours. I was able to get my table within .002" across the entire span, but my problem was adjusting the plates to make them level. I would adjust one just to see it change the values at the other three measure points and it was not easy to fine tune the system. Do you have a better setup for leveling? I am going to change my open end plates out one of these days for some that are a little taller and I want to design in a leveling system that I can fine tune easily to get the accuracy that I want.
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

Claudio
Posts: 26
Joined: Wed Nov 13, 2013 12:48 pm

Re: Making a spindle square

Post by Claudio » Fri Mar 28, 2014 9:29 am

danimal wrote:Claudio, that looks great! The dial that I bought is not nearly as accurate as yours.
The dial i just borrowed from a friend but it is way to accurate: just breathing near the Shapeoko changes the value ;)

danimal wrote:Do you have a better setup for leveling?
For leveling I just mounte my calipers in place of the spindle
IMG_20140116_143218.jpg
IMG_20140116_143218.jpg (108.43 KiB) Viewed 6412 times

CalebPeters
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Re: Making a spindle square

Post by CalebPeters » Mon Mar 31, 2014 2:05 am

danimal,

That's very cool. Thanks for sharing your idea and BOM. I know that I'll be making one.
Shapeoko 2 #3164 : GRBL, NEMA 23 motors, 350W Spindle, Limit/home switches, Drag chain, X-Carve Upgrade.
DIY-Oko 3 #-1 : LinuxCNC, PC-450 with Super-Pid, Hall Effect Limit/home switches.

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