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Adventures in CNC routing #3: Designing a mancala board

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Blog entry by Tooch posted 12-19-2017 11:07 AM 1939 reads 0 times favorited 12 comments Add to Favorites Watch
« Part 2: Fixing and editing tool paths Part 3 of Adventures in CNC routing series Part 4: Sorry my last post got hijacked »

I was recently introduced to the game “Mancala”, and thought the board would be something fun to try and produce. About 2 weeks after that I was reading an article about making simple board games (including Mancala) using templates on the router table and thought, this looks like something I could even do on the CNC.

I began with trying to create the basic plan based on other dimensions that I had seen online. It calls for 12 smaller, normally circular, pockets, and 2 larger pockets at each end. Because I want to be able to fold it in half, I left a little material in the middle for a saw kerf after milling.

I remembered that I had an 1-1/4” pattern bit with rounded corners that I used on a couple projects a few years ago, and thought that would be perfect for this application. The first result wasn’t bad, but after testing it with stones I realized the pockets were a little small.

I decided to change the circles to a more elongated rectangle to increase the size of the pockets for more stones. There is a rectangular pattern tool on VCarve that I found which helped with spacing and layout of multiple items.

By keeping the roundover of the corners equal to the roundover of the bit, I was able to keep the resulting toolpath relatively simple, cutting down on carving time.

The result was something I liked a lot better than the original.

The initial test were done on softer scraps of pine. After running it on a piece of oak, I saw that there was considerable burning (not pictured), which meant that I had to change the feed/speed/depth of cut. Although the layout looks good, there is still some room for improvement if I hope to use hardwoods. I’m not sure what will help reduce the burning, but hopefully I can figure it out before Christmas :-P

-- "Well, the world needs ditch-diggers too..." - Judge Smails



12 comments so far

View Blackie_'s profile

Blackie_

4843 posts in 2386 days


#1 posted 12-19-2017 11:50 AM

Very nice Tooch.

CNC was a topic I brought up at my last woodworker meeting early this month, I was interested in the X-carve, but my fellow woodworkers mentioned laser instead of router said it does better in sharp corners for what I was wanting it for, the $400 machines made in china were brought up.

After I got home I started looking at reviews on both the x-carve router and the china laser machines and I wasn’t finding anything to my liking, there were issues with both the x-carve and the china lasers aside the fact that I was skeptical of the china cheap machines anyway.

It was at this point that it dawned on me, laser is no more than precise wood burning and I already have a colwood pyrography machine and after looking at images on google I was amazed at what can be done with a pyro machine and all done by hand no need for a machine and less real estate used up in the shop. Burning by hand vrs machine both came out the same when comparing images from them both.

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at http://www.facebook.com/randy.blackstock.custom.wood.designs

View robscastle's profile

robscastle

4720 posts in 2078 days


#2 posted 12-19-2017 01:44 PM

Tooch

Fantastic job on the board.

The term Mancala is a generic name for the board type games.
From the great board you have produced it sounds like you possibly mean Sungka.

Who introduced you to the game? the reason I ask is depending what nationality they are will determine the exact name.

-- Regards Robert

View doubleDD's profile (online now)

doubleDD

7019 posts in 1917 days


#3 posted 12-19-2017 01:54 PM

Looks like you are on your way. Keep at it, Christmas is nearing quickly. I wish I knew more about those machines.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View DS's profile

DS

2855 posts in 2294 days


#4 posted 12-19-2017 03:31 PM

Burning is typically a result of a chip load that is too low.
Chips carry off heat with them.

To increase the chip load, speed up the feed rate, or reduce the spindle rpm. (or both)

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

View Jim Jakosh's profile

Jim Jakosh

19957 posts in 2979 days


#5 posted 12-19-2017 04:32 PM

Nice work. The increased feed rate will eliminate the burning. I get that with the hand router if I hesitate in one spot too long.

Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View hoss12992's profile

hoss12992

3989 posts in 1766 days


#6 posted 12-19-2017 06:13 PM

I really look forward to your post on this subject. As I have a interest in possible getting a CNC Shark but have never used one, your post are VERY helpful. Thanks for sharing and Merry Christmas buddy

-- The Old Rednek Workshop https://www.facebook.com/theoldrednekworkshoptn

View robscastle's profile

robscastle

4720 posts in 2078 days


#7 posted 12-19-2017 09:37 PM

Oh here we go I will just give Chris Kyle a call.
Standby for the crack and thump!

Rosysosy will not be quite so rosy however possibly still be red though!

-- Regards Robert

View robscastle's profile

robscastle

4720 posts in 2078 days


#8 posted 12-19-2017 11:05 PM

-- Regards Robert

View robscastle's profile

robscastle

4720 posts in 2078 days


#9 posted 12-19-2017 11:13 PM

Something about a bloody plumber

رقم سباك بالمدينة المنورة Edit

raqm sabak bialmadinat almunawara

Plumber number in Madinah

-- Regards Robert

View Blackie_'s profile

Blackie_

4843 posts in 2386 days


#10 posted 12-20-2017 12:42 PM

Is all of this crap going to be removed?

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at http://www.facebook.com/randy.blackstock.custom.wood.designs

View robscastle's profile

robscastle

4720 posts in 2078 days


#11 posted 12-20-2017 02:36 PM

What!? ....Crap … dont you like my sence of humour?

I will give Chris another call! he must have missed again.

-- Regards Robert

View NormG's profile

NormG

5889 posts in 2877 days


#12 posted 12-22-2017 09:20 PM

Great idea to build your own, thank you for sharing the process and the result

-- Norman - I never never make a mistake, I just change the design.

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