CNC Parallel Rule (fence)

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Project by Henri Monnier posted 07-12-2013 04:15 PM 3891 views 1 time favorited 6 comments Add to Favorites Watch
CNC Parallel Rule (fence)
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Today finally finished the CNC Parallel Rule for my table. This will allow me to more quickly get a project locked down, properly lined up with the ‘X’ axis. It is a design idea from Peter Pasuello on another forum. See his video at

I tried to make one of these manually, and I believe that all the drillings were in the correct places, but I was unable to get proper adjustment with it. So I put it on the machine and let it cut it, and it was BANG straight on when it was assembled…..

As with all my projects the .dfx and/or the .crv3d files are available.

-- |~ Henrii~|- - We'll be friends till we're old and senile... Then we'll be new friends!!

6 comments so far

View bowtie's profile


990 posts in 2709 days

#1 posted 07-12-2013 04:45 PM

good idea and a professional looking job.

-- bowtie,.....jus passin thru....

View steliart's profile


2894 posts in 3052 days

#2 posted 07-12-2013 07:42 PM

Nice parallel ruler, well made.
The link you provide is a payable registration side

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions !!!

View choppertoo's profile


301 posts in 3677 days

#3 posted 07-13-2013 12:26 PM

please forgive my naivete but can you give an example of how/when you would use this?


-- The greatest danger for most of us is not that our aim is too high and we miss it, but that our aim is too low and we reach it.. Michelangelo

View Henri Monnier's profile

Henri Monnier

45 posts in 2230 days

#4 posted 07-13-2013 02:50 PM

Chopperton, Good question…

I used to have an ‘L’ shaped ‘fence’ that was cut by the machine to be ‘trued’ to both the ‘X’ and ‘Y’ axies. See:

It was positioned by dowels located in the spoilboards, so that it could be removed/replaced and when later re-installed, it would remain true to both axies.

The ‘L’ fence’s function in life was to insure that a workpiece was held true to both the ‘X’ and ‘Y’ axies while affixing the holddowns. It did have some holddown locations along the fence itself for clamping. However it was a bit of a PITA to remove and reinstall when I had a need for the table space (width primarily).

This Parallel Rule accomplishes the same thing – providing a ‘fence’ to register the workpiece against so it is true to the ‘X’ axis. But is easy to remove/replace and maintains the ‘X’ axis accuracy. I had also found it unnecessary to ‘true’ both axies. Additionally it does make it easier to access the ‘T’ tracks mounted along the sides of the spoilboard pieces. Another big advantage, it removes unneeded hardware from the table surface during the cutting phase.

In use, you simply register the Parallel Rule against the edge of the spoilboard, lock it down, then register the workpiece against it, lock the workpiece down to the spoilboards on 3 sides, pop off the Parallel Rule, and lockdown the remaining side of the workpiece.

You end up with a workpiece registered to your ‘X’ axis, and also have a less cluttered work area.

I hope that answers your query….

-- |~ Henrii~|- - We'll be friends till we're old and senile... Then we'll be new friends!!

View a1Jim's profile


117618 posts in 3941 days

#5 posted 07-13-2013 03:23 PM

Looks Like a good and useful tool. I was a bit puzzled how this was used too,but you explanation made it all clear.
Perhaps calling it a CNC parallel rule is a bit more explanatory .

View Henri Monnier's profile

Henri Monnier

45 posts in 2230 days

#6 posted 07-13-2013 04:55 PM


Good comment on the name… Consider that done…..

The only thing I sorta ‘lost’ with this “CNC Parallel Rule” over the old ‘L’ fence was the ability to partially cut something, then take it from the machine, and replace it sometime later to finish it. You did not have to record any positional settings.

However, there is a way, you just need to have a ‘registration spot’ on the workpiece that you have recorded the ‘X’ (only if you used the ‘extension rail) & ‘Y’ coordinates. Simply put the recorded positional information into the machine coordinates and go from there…

I like the uncluttered table most, and the ease of setup.


-- |~ Henrii~|- - We'll be friends till we're old and senile... Then we'll be new friends!!

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