Author Topic: Pull My Finger  (Read 7850 times)

Offline zeeprogrammer

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Pull My Finger
« on: February 23, 2020, 11:25:55 PM »
What a lousy topic title.  ;D

As many of you know, I just received a Sherline lathe and mill with the intention of converting them to CNC.
But before I do that, I want to learn a little about the capabilities and, most important, the feel of the machines.
So I decided to build a finger treadle engine (actually two of them as gifts to my daughters).

Attached is a CAD of the engine's assembly. I can't seem to find the plans I got but a google search on "finger engine kaje" will get you similar stuff.
It's apparently an improved version of a NAMES plan.

Also attached is a photo of the bits of metal I intend to use.

The plan calls for a 3" flywheel which I don't have. I do have a couple of smaller flywheels from a past project.
I'll start with that and see how it goes. I can change it out later.

Not shown is the base. I have a couple of pieces of wood for that.

This may be slow going. I have the CNC stuff to pursue and T is starting to make noise about gardening.
I'm also helping with daycare for grandson.
He's only 7 months old but you should see him when I take him for a walk through the shop. His arms and legs go crazy as we enter the shop and he loves to see me turn the machines on.
I don't do anything other than turn on and off the machines.

I intend to turn him into an engineer.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline propforward

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Re: Pull My Finger
« Reply #1 on: February 23, 2020, 11:42:49 PM »
Nice! Wasn’t sure what to expect when I clicked on the thread, but looks like a fun project!
Stuart

Forging ahead regardless.

Offline cheepo45

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Re: Pull My Finger
« Reply #2 on: February 23, 2020, 11:51:58 PM »
I built one of these finger engines.
I redrew the plans to make them more cnc friendly.
PM me and I will send you the files.
 Scott

Offline crueby

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Re: Pull My Finger
« Reply #3 on: February 23, 2020, 11:58:45 PM »
Exactly the title I'd expect!  :Jester:


Swarf! Swarf! Swarf!

Offline cheepo45

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Re: Pull My Finger
« Reply #4 on: February 24, 2020, 12:03:38 AM »
Here is a video of my finger engine.
 Scott
<a href="https://www.youtube.com/watch?v=chtuD2SWYIg" target="_blank">http://www.youtube.com/watch?v=chtuD2SWYIg</a>

Offline crueby

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Re: Pull My Finger
« Reply #5 on: February 24, 2020, 12:09:34 AM »
You gotta make 5 of them, keep the whole hand busy!

Offline Doc

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Re: Pull My Finger
« Reply #6 on: February 24, 2020, 12:41:59 AM »
Whats the red line RPM  :ROFL:

Offline zeeprogrammer

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Re: Pull My Finger
« Reply #7 on: February 24, 2020, 01:11:14 AM »
Thanks guys.

I redrew the plans to make them more cnc friendly.
PM me and I will send you the files.

Thanks Scott. I'll be doing this manually to get a feel for the machines before I convert them to CNC.
Nice video!

Whats the red line RPM  :ROFL:

Good question. I suppose it depends on how fast my finger can tap...or which finger is faster. Must be careful though. I could choose the wrong one.

You gotta make 5 of them, keep the whole hand busy!

Now wouldn't it be neat if the engine made some noise and each of the five made a different sound? A one-handed instrument.

Nah.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Flyboy Jim

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Re: Pull My Finger
« Reply #8 on: February 24, 2020, 02:25:03 AM »

Now wouldn't it be neat if the engine made some noise and each of the five made a different sound? A one-handed instrument.

Nah.

Zee..................Liberace of Model Engine Maker!  :naughty:

Jim
Sherline 4400 Lathe
Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline zeeprogrammer

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Re: Pull My Finger
« Reply #9 on: February 24, 2020, 12:09:05 PM »

Now wouldn't it be neat if the engine made some noise and each of the five made a different sound? A one-handed instrument.

Nah.

Zee..................Liberace of Model Engine Maker!  :naughty:

Jim

 :facepalm:

The title of this thread is also an instruction.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Flyboy Jim

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Re: Pull My Finger
« Reply #10 on: February 24, 2020, 02:07:51 PM »

Now wouldn't it be neat if the engine made some noise and each of the five made a different sound? A one-handed instrument.

Nah.

Zee..................Liberace of Model Engine Maker!  :naughty:

Jim

 :facepalm:

The title of this thread is also an instruction.

 :Jester:   :ROFL:  :lolb:
Sherline 4400 Lathe
Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline zeeprogrammer

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Re: Pull My Finger
« Reply #11 on: February 24, 2020, 03:33:13 PM »
I know Chris, Jim, and Hugh made a plate to prevent their QCTP from rotating.
Does anyone have a drawing?

Drilling/tapping the QCTP is a bit scary for me so I'm thinking of milling a step into the plate that the QCTP will sit against. But I'm not sure it would be tight enough against the QCTP.
A thought might be (instead of milling a step) is to take a small bar that is bolted to the plate and thereby can be adjusted up against the QCTP.

I would still do the relief in the QCTP.

Initially I thought about using a 1/8" plate but I'm concerned there's enough meat for the step and for holding.
I'll probably try 1/4" and shave it down a bit.

I have no steel in the size needed and will use aluminum.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Hugh Currin

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Re: Pull My Finger
« Reply #12 on: February 24, 2020, 04:06:36 PM »
Zee:

Here are mine. They are a little different as they don't rotate, which I find OK for CNC. One short one and a taller one. I typically use a riser block on the lathe which needs the taller one. If you use, you should check dimensions of your QCTP.

Hope this helps.

Hugh
Hugh

Offline Flyboy Jim

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Re: Pull My Finger
« Reply #13 on: February 24, 2020, 05:47:26 PM »
I know Chris, Jim, and Hugh made a plate to prevent their QCTP from rotating.
Does anyone have a drawing?

Drilling/tapping the QCTP is a bit scary for me so I'm thinking of milling a step into the plate that the QCTP will sit against. But I'm not sure it would be tight enough against the QCTP.
A thought might be (instead of milling a step) is to take a small bar that is bolted to the plate and thereby can be adjusted up against the QCTP.

I would still do the relief in the QCTP.

Initially I thought about using a 1/8" plate but I'm concerned there's enough meat for the step and for holding.
I'll probably try 1/4" and shave it down a bit.

I have no steel in the size needed and will use aluminum.

Zee.............just for reference. My plate is 7/64"  (.109"). Drilling and tapping my aluminum A2Z tool post was no problem. I'm not sure if yours is aluminum or steel.

Jim
Sherline 4400 Lathe
Sherline 5400 Mill
"You can do small things on big machines, but you can do small things on small machines".

Offline zeeprogrammer

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Re: Pull My Finger
« Reply #14 on: February 24, 2020, 06:01:34 PM »
Thanks guys. That's very helpful.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

 

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