 | | Re: Is the 8455 available in stores?
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(...) US or (...) is (...) Ontario (...) It's available at Evans stores in Wisconsin. John (21 years ago, 7-Oct-03, to lugnet.technic)
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| | Re: Pneumatic/Motorized Camera Tilt Unit
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(...) [snip] (...) My bad. (...) I would think that you can easily do it with one motor for the front, one motor for the back (greatest flexibility. You'll have to use the other variety motor to rotate the turntable. (...) Fun, eh? [snip] (...) The (...) (21 years ago, 7-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic/Motorized Camera Tilt Unit
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(...) No, if you look at the photos you'll see that each piston is joined above the platform. It's not the best system because of the lower power you achieve with retraction versus extension, but it works best when you're trying to keep everything (...) (21 years ago, 7-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) [snip] (...) Your original system had the pistons underneath the platform, right? You must be assuming that the ganged pistons would be underneath. This is not a requirement. I'm not advocating for ganged pistons. I'd think that a geared (...) (21 years ago, 7-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: New (at least to me) optimal geometry for pneumatically flipped switches
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(...) Hi Mark, Do you have an image of the original geometry, and your modified version? I could not find 8868 on BrickShelf's scanned library. Kevin (...) The new valves are superior in my mind as well. Another plus is they require less parts to (...) (21 years ago, 7-Oct-03, to lugnet.technic)
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| | Re: Lousy photo's
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(...) It indead is a great model. But is a pitty the quality of the images is very poor. The crane is a very well succeeded copy of the original Liebherr crane (it probably is an LTM1300 of the German crane hire and heavy hauler Prangl). I'm (...) (21 years ago, 7-Oct-03, to lugnet.technic, lugnet.modelteam)
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| | Re: Pneumatic Camera Tilt Unit
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(...) Yes, stop-motion has much different requirements than realtime filming. Actually, if I was looking for a fast realtime cut from top to bottom, the current mechanism is perfect. It moves quite fast. (...) running IE 6, XP Pro. Any clue why? (...) (21 years ago, 7-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) It only now occur to me that it's animation we're talking about, not filming. In that case it does not matter hos long it takes etc. between the shots (sure, fast is better it don't need to be 30fps fast). Then you could easily build a (...) (21 years ago, 7-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: New robots and other goodies
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Oh, forgot to mention; I get DNS-errors (unresolved hostname) a lot on your site, don't know if it's on my end, yours or inbetween. Hitting reload helps! I don't experience these problems on other sites so it might be on your end, or the DNS-server (...) (21 years ago, 7-Oct-03, to lugnet.technic)
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| | Re: New robots and other goodies
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(...) Hi Rob, (...) Hm, since I can't recall seeing your site before I can't judge the improvements, but I do like the site as-is. I have some grudge against using Java on pages for simpler things but I approve on yours. (...) Very interesting, (...) (21 years ago, 7-Oct-03, to lugnet.technic)
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| | Re: New (at least to me) optimal geometry for pneumatically flipped switches
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(...) I used the geometry from the alternative model of 8868 crane truck for a long time (this was a bin lorry). However, I found that raising the bottom end of the piston up off the beam that the valve is attached to is a good idea as it helps to (...) (21 years ago, 7-Oct-03, to lugnet.technic)
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| | Re: New robots and other goodies
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(...) Thanks! Let me return the compliments: I really like your site as well. You have done a great job with the renderings and provide excellent information. Your site reads like a technical journal. I like it a lot. I want to build my own version (...) (21 years ago, 6-Oct-03, to lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) It just so happens that I have a good geometry :^) (URL) Very true. I'll have to try that. Thanks for the idea! Sure. It is always a pleasure to talk to you Mike. (...) Kevin (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) You really don't *need* both sides actuated, but it allows one to raise the platform as well. Not really necessary, I suppose. I presume you mean two pistons ganged end-to-end. I think this would work much better, but so far have not found any (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | New (at least to me) optimal geometry for pneumatically flipped switches
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I used the same geometry for pistons flipping switches for a long time, but decided to see if I could come up with something better. The new geometries take less parts than my older geometry, and get better range of motion. My old tried and true (...) (21 years ago, 6-Oct-03, to lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) Two reasons. One, using a motor didn't occur to me. ;) Two, I don't have any rotation sensors either. I'm also unsure how I could use a motor to tilt and raise at the same time, though I don't think that's a movement needed very often. I could (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) [snip] (...) Ah..., but you don't really need the back and the front controlled by pistons do you? I would think that keeping the front hinged and the back actuated would give you what you want. With two pistons ganged together, you can (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) Yes, you're right - two switches would have been entirely sufficient. I just wanted another switch so I could add a release valve, that's all. :) I think originally I wanted something in there so I could bypass the tank and pump directly to (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | Re: Pneumatic Camera Tilt Unit
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(...) They work for me now also. (...) I guess I was curious why you used pneumatics. I would think a motor/gear/rotation sensor would give you very fine angular resolution and variable speed. You also would only need to control either the front or (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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| | OT: Interesting resource on lever mechanisms.
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Found this while digging through Rob Stehliks excellent site and thought it might be of interest: (URL) like to try my hands on making some of them in brick, but by all means do try them if you want to - I'd probably just add it to my ever growing (...) (21 years ago, 6-Oct-03, to lugnet.technic)
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