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Pumpkin drop event

Cutting foam sheets... with a needle!

Headbang

Well-known member
Looks good! Is this the 15k RPM version?
This motor will only do 12k, in reality aprox 10500rpm. Already working on another sleeve crank for a 2205 2300kv motor. Thought of a better way to do the crank bearing that will be more stable and spread the bearing load over a few bearings. That will be in the next version. But for loading up the jeep. It is Timber Tuesday!
 

Headbang

Well-known member
So need to make a more stable bearing setup on the sleeve crank. I am also going to have to put in some guides half way up the needle to stabilize it at high rpm. Had it up at 10k rpm, so much more quiet and stable then the clothes pin crank. Cut out a sheet (ft edge wing). Mig tip was cold to the touch all the way though the cut.
20191001_180748.jpg 20191001_180830.jpg
 

Michael763

Well-known member
So need to make a more stable bearing setup on the sleeve crank. I am also going to have to put in some guides half way up the needle to stabilize it at high rpm. Had it up at 10k rpm, so much more quiet and stable then the clothes pin crank. Cut out a sheet (ft edge wing). Mig tip was cold to the touch all the way though the cut.
Wow! Congratulations!
 
I would like to thank everyone who shared files and knowledge with me on my road to making a needle cutter. Especially Keno for posting raw files! And DKJ4Linux for creating and keeping this thread alive!

I have combined many files and ideas originated and mixed by others to create my best attempt at an awesome needle cutter!

I ran it at the motors max speed (13,422 RPM) for 30 minutes and was able to hold my finger on the mig tip as it and the heat sync remained cool to the touch.

Hopefully once I balance the motor and pump in 12 volts vs 11.1 off of battery power the motor will get above 14,000.

Thanks again!!
 

Attachments

Headbang

Well-known member
I would like to thank everyone who shared files and knowledge with me on my road to making a needle cutter. Especially Keno for posting raw files! And DKJ4Linux for creating and keeping this thread alive!

I have combined many files and ideas originated and mixed by others to create my best attempt at an awesome needle cutter!

I ran it at the motors max speed (13,422 RPM) for 30 minutes and was able to hold my finger on the mig tip as it and the heat sync remained cool to the touch.

Hopefully once I balance the motor and pump in 12 volts vs 11.1 off of battery power the motor will get above 14,000.

Thanks again!!
That is awesome! The fan may be a bit overkill but heck, why not! The heat will not happen until you start using it, it builds up as the needle drags while cutting. But based on my experience you will have no issues. I like big fat bearings! Bearing size is my down fall right now.
 

Keno

Active member
So need to make a more stable bearing setup on the sleeve crank. I am also going to have to put in some guides half way up the needle to stabilize it at high rpm. Had it up at 10k rpm, so much more quiet and stable then the clothes pin crank. Cut out a sheet (ft edge wing). Mig tip was cold to the touch all the way though the cut.
/QUOTE]
I think you nailed this one, thank you for your work. Are we going to see this on thingiverse?
 
When I was a kid in 1950-ish, television was a pretty brand-new thing... small circular screen, b/w, etc. Howdy Doody, which I watched almost religiously, was probably my favorite show... but "westerns" were also one of the most popular early-on program genres. And westerns (at least the ones without any Indians...) were most often the good guys in white chasing the bad guys in black, who ran in outlaw gangs and had just robbed a bank... and always had a surprisingly nice-looking hideout deep in the woods and/or in a remote box canyon somewhere. And, oddly for a small kid, I often thought those hideouts looked like they would be a really neat place to live...

Well, here's my new hideout... and this weekend (with the help of my kids) I'm making a run for it!

20190802_112442.jpg

20190802_112339.jpg

If I don't get caught and hung, or mortally wounded, I'll see ya later ;)

-- David

PS: The kids are headed this way today. We'll pack me up over the next couple of days... and hopefully make our break on Saturday or Sunday. I hope to sneak a peek now and then to try to keep up... you guys are a moving target and doing great! Thank you all!
 
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Headbang

Well-known member
So I have lost track of how many sleeve cranks I have printed. In the end I have landed on 2 3x7x3 ceramic bearings, and a 3mm x 16mm bolt as a shaft. This seems to be working stably. No heat build up in the shaft. Ran it at 10800rpm today for 2hrs. Only thing it needed was a drop of oil in the cotton oil well after the first hour. Installed and cut 2 sheets tonight. Very much an improvement over the clothes pin crank. Time will tell tho how robust it is. Now on to the next one with a 2205 2300kv motor.
 
So I have lost track of how many sleeve cranks I have printed. In the end I have landed on 2 3x7x3 ceramic bearings, and a 3mm x 16mm bolt as a shaft. This seems to be working stably. No heat build up in the shaft. Ran it at 10800rpm today for 2hrs. Only thing it needed was a drop of oil in the cotton oil well after the first hour. Installed and cut 2 sheets tonight. Very much an improvement over the clothes pin crank. Time will tell tho how robust it is. Now on to the next one with a 2205 2300kv motor.
What oil are you using?