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Modular Marble Machine #5: The Crank

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Blog entry by William posted 04-12-2013 11:25 PM 1262 reads 0 times favorited 18 comments Add to Favorites Watch
« Part 4: Base Plates Part 5 of Modular Marble Machine series Part 6: Riser Blocks »

If you’ve been keeping up, we are just about ready to start building the actual pieces to make a marble run. The only thing we have left is a crank handle to operate the pump assembly.

To attach a shaft to the pump, running to the outside of the base box, we are using a half inch dowel. That dowel has a hole drilled the same size as the metal shaft. Then the dowel is split with a band saw down the middle of that hole. This slips over the shaft.
Next we have to pinch the dowel down onto the shaft. To do that we take a block of wood and drill a half inch hole through it. Then we drill and countersink four holes for screws. Then we split the block right down the middle of the half inch hole. Next, drill the hole larger on the countersunk side, just large enough for the four screws to pass through cleanly without catching threads. We want the screws to pull this top piece to the other one. So the threads do not need to catch that piece at all or it won’t tighten.
After all that is done, and the screws are in the block to hold it together, slip the block onto the metal shaft. Put the wooden dowel through the side of the box and slip it over the metal shaft. Now pull the block back over the wooden dowel and tighten it down, pinching the dowel down onto the metal shaft.
This all creates a good enough fit to turn the pump rod. Now, if something jams up enough to completely stop the pump, this clamping system will slip. That is on purpose. You’d rather the rod connection slip than for a jam to destroy some part of the pump, or anything else. A jam is unlikely as long as we do everything else correctly, but you never know. It’s better to be safe than sorry.

Now this part is not actually necessary, but I thought the outside of the box looked too plain. So I decided to add a dress up piece with an arrow cut out with the scroll saw. I made this out of a piece of walnut for a nice contrast to the color of the box.

Next, in my opinion, there was just too much play in the wooden dowel shaft as it came through the side of the box, so I added a block to the inside to give it more stability.

Then I made the crank from a piece of sapelle. The crank handle is made out of mystery wood. It is a piece of wood that a friend sent me for pen blanks that I have yet to properly identify, so I’m calling it mystery wood for now.
The reason I used a pen blank for that part is that I just needed a small piece of wood to turn for a crank handle, and this piece looked good to me next to the walnut and sapelle. All the dowels I have are softwood, mostly pine. I did not want to use pine for the crank handle, so I turned a piece for it on the lathe.

Now everything for a functioning feed system and base is finally complete. We can now start on actually building pieces.

-- http://wddsrfinewoodworks.blogspot.com/



18 comments so far

View DIYaholic's profile

DIYaholic

14144 posts in 1398 days


#1 posted 04-12-2013 11:44 PM

The foundation is set! May the build commence.

I like the addition of the “stabalizing block” for the crank/shaft, along with the crank handle direction indicator!!!

-- 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 William's profile

William

9222 posts in 1565 days


#2 posted 04-13-2013 12:03 AM

Thanks Randy.
When are you going to build a marble machine?

-- http://wddsrfinewoodworks.blogspot.com/

View StumpyNubs's profile

StumpyNubs

6259 posts in 1524 days


#3 posted 04-13-2013 12:05 AM

You sure know your way around a marble machine! When it’s done can I have it? I promise to never lose my marbles! :)

You’d better keep it, I probably WILL lose my marbles.

-- It's the best woodworking show since the invention of wood... New episodes at: http://www.stumpynubs.com

View DIYaholic's profile

DIYaholic

14144 posts in 1398 days


#4 posted 04-13-2013 12:17 AM

I can’tz be buildinating a marble machine….
I ain’t gotz no marbles!!! No, I didn’t lose my marbles….
I never had any!!!

-- 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 Dave's profile

Dave

11200 posts in 1563 days


#5 posted 04-13-2013 12:51 AM

Its getting bigger.
Mouse trap the game comes to mind.
looking good William

-- Superdav "No matter where you go - there you are." http://chiselandforge.com

View gfadvm's profile

gfadvm

11370 posts in 1413 days


#6 posted 04-13-2013 12:57 AM

William, Your creations just amaze me! I was lost when you posted the pump! But I’ll be following along as your stuff always turns out to be fascinating. I had Hell getting my candy machine to work! Think I’d best stick to boxes.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View William's profile

William

9222 posts in 1565 days


#7 posted 04-13-2013 01:22 AM

Thanks guys.

Stumps, you should check out the base installment. I used a machine designed by some guy named Stumps.

Randy, YOU CAN DEW IT!

Dave, it isn’t mouse trap quality yet, but wait until I’m done and it may just be comparable.

Andy, these marble machines are definately only for someone who likes testing, testing, retesting, and then doing over and testing some more. Hey, maybe I have lost my marbles.

-- http://wddsrfinewoodworks.blogspot.com/

View grizzman's profile

grizzman

7151 posts in 2026 days


#8 posted 04-13-2013 02:00 AM

its looking really good william, im always intrigued with these marble machines..now if we could only identify that darn piece of wood…lol…grizz

-- GRIZZMAN ...[''''']

View William's profile

William

9222 posts in 1565 days


#9 posted 04-13-2013 02:41 AM

No worries Grizz, it isn’t one of the blanks you sent. These came from another friend from up north.
I was looking earlier, I now have about fifty to sixty marble run track pieces to make and about as many spacer blocks. So I still have my work cut out for me. Just saying that I think makes me want to go to bed.

-- http://wddsrfinewoodworks.blogspot.com/

View JL7's profile

JL7

7414 posts in 1688 days


#10 posted 04-13-2013 02:47 AM

You keep cranking it up! Looking good as always…..how many more marbles do you have left to lose?? I’d think you’d be out by now…..

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

View William's profile

William

9222 posts in 1565 days


#11 posted 04-13-2013 03:04 AM

I’ve got a few trick, eh marbles, up my sleeve.
This is the fourth one I’m working on now.
All have been closely tied to someone else’s plans.
I plan on my fifth being a creation of my own design.
Thanks Jeff.

-- http://wddsrfinewoodworks.blogspot.com/

View Jamie Speirs's profile

Jamie Speirs

4157 posts in 1580 days


#12 posted 04-13-2013 08:37 AM

William is is coming along really nicely
The pen blank is sensible as you need a good strong piece
Your arrow idea must be shown to the designer, I can imagine
that the wrong direction could mess up some bits.
This is definitely the machine to let you try out new designs on.
Jamie

-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

View stefang's profile

stefang

13530 posts in 2057 days


#13 posted 04-13-2013 08:54 AM

Looking good!

-- Mike, an American living in Norway.

View William's profile

William

9222 posts in 1565 days


#14 posted 04-13-2013 11:13 AM

Thank you Stefang.

Jamie, actually, turning the crank the wrong way won’t hurt anything. It would just back the marbles up into the feed chute. I think the arrow was a nice touch though.
Thank you. I’m glad everyone likes it.

I feel I’m boring sometimes giving all the details of a project such as this. I decided to do a detailed blog about it because, with the last three marble machines, I’ve gotten contant questions from people regarding if they’re hard to do, how much time it takes, and such. They aren’y hard at all. They do require a lot of patience though, and they are extremely time consuming.

Thank you all for taking the time to read all my rambling ons about the build of things such as this though. I appreciate the fact that someone takes the time out of their day to do that.

-- http://wddsrfinewoodworks.blogspot.com/

View Roger's profile

Roger

15055 posts in 1527 days


#15 posted 04-13-2013 11:34 AM

Yes, the arrow is a nice touch.

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

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