Supporting > Additive Machining
Pendulum Clock
Krypto:
It can do a decent job, within a minute a day, but I had trouble keeping the clock running. The first run went over a week, but later on I had troubles. I think the spring I used for the clutch was a little strong and perhaps some of the gear axles, which are just 1/16" music wire, may have bent a little while adjusting the time. It's difficult to diagnose the problems with the clock when it will run for a few days and then just stop.
This was a winter project and I kinda forgot about it until now. Right now the workbench is clear so maybe I'll try and tear it apart, inspect the axles, give it a good clean and see how it runs after that.
Here's a video I shot the highlights the re-winder mechanism.
http://www.youtube.com/watch?v=3dM3IGUsbnE
wagnmkr:
I have the main frame pieces printed and epoxied together. I did it in two pieces as my printer bed is barely big enough to do 1 piece and I wanted to do a good brim around the parts to keep them from lifting, which apparently is what these pieces want to do no matter what printer they are on.
crueby:
Krypto - did you make that re-winder gizmo?
ddmckee54:
wagnmkr:
Everything expands when it gets hotter. The plastic that you are using will shrink as it cools, causing the warping. Heating the print bed helps, but when you start printing tall parts, you'll still have a 150 degree C temperature difference between the top of the print and what's contacting the print bed - something is bound to give.
When I was printing the main hull part for my RC Benchy I kept getting one spot that lifted off the bed, and a layer shift about 70-80% thru the print - it was a 22 hour print with no support and was about 210mm tall. You were supposed to be able to print it with no support and no brim. I printed it 4 times before I got a good one. First with no brim and no support, second with support and no brim, third with a brim and no support, and lastly with support and a brim and got a winner. - took over 26 hours. It was all caused by the print warping slightly as it cooled.
Everybody's printer has a different personality and behaves differently. You need to find out what yours' likes and work with it.
Don
AlexS:
Awesome. Hint me to get back working on my metal clock
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