What are the calculations used to design these gears? I can't figure out how to get the dimensions on the rack correct to mesh properly with a pinion like this.
That is... something else. haha. I see advertisements for this thing in early 1979 computer mags like Creative Computing -- but I can see why it didn't really go anywhere. Needed good games to survive.
OH wow... that's pretty lame. I was wondering about VideoBrain, but it doesn't look like I'm going to go out o my way to find one now. Thanks for sharing.
+Sean Connolly When the gears are mashed properly, none to speak of. Same as properly tightened belt. If the gears are too lose, yes backlash!. If they are too tight together, you get a tooth width pattern on the print, but still no backlash. :)
Long John Actually, that effect is not seen on my camera, or the original video. Only on RU-vid! RU-vid is getting dizzy watching my printer make circles. ;)
Glankonian I'm currently building one of your Wallace G1 designs, I basically have the extruder and electronics left to finish, install and calibrate. I'm finding that another advantage to the rack and pinion drive is you can run the steppers at a lower current since you don't have all that belt tension working against you. That's a big plus on several levels (energy efficiency, less heat, longer component and motor life, etc.) .
VideoBrain. One of the very few programmable systems to be discontinued in the 1970s - it was discontinued in spring 1979 after one year on the market. The RCA Studio II also bit the dust in 1979. I think the Coleco Telstar Arcade was discontinued in 1978. Both of those systems being far less advanced than the VideoBrain. Even the Channel F was made until 1981 or so. April 13, 2015 2:10 am
That's a sweet looking machine! I'm impressed with how everything is laid out so cleanly. That extruder is fucking wicked though, man. I'm super impressed.
In order, I find the R&P as accurate as a properly adjusted belt. I now have 2 units on R&P and haven't had to touch the Y yet. I originally just put together a regular 8mm Wallace. When I had found the Y beld had gone slack while I was assembeling the X stage, I decided to do something about it. Didn't like the Y belt set-up to start with. I have Ideas on how to power the X Carriage, and yes the motor on the carriage would add weight. Too busy Using Wallses to expiroment...
Hi, I really like this Idea. It saves buying belts and pulleys if you can make them. I have a few questions. Is the accuracy any better compared to the belt drive or is it the same? Does this require more or less maintenance? Why did you use a belt for the other drive and not a second rack & pinion? If the answer to the third question was to do with weight, would the rack and pinion not compensate for the extra weight by removing the flex of the belt? Thanks Great work. Mike
No, Not intentional. :( The extender I was using to get the smaller J-Head below the X-carriage seems to have too much play in it. I am replacing it with an alternate design. The head should not bob like that.
Brilliant - keep the Videobrain videos coming its a system very little is known about and until MESS emulates it better, this is as close as we can get.
Sony DCR-HC30 Digital handycam. It has a feature that if you hook up the AV out and the Ieee-1493(?)FireWire ports, it acts as a vid capture device. My voice was captured on a tape recorder and re-synked later. :(
Thank you for posting this. I just picked up a few games for this console at a thrift store and I am seeking out as much information about the console as possible.
