That is interesting 3DDave. I concur with the things they say about changing layer numbers etc. Very interested in alternative materials. (I have had a reel of ASA for ages and not found anything to use it on. I'll give that a try sometime.)
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Very interesting the air leaks "though everything". Originally, I tried using varnish to seal the PLA. That was no help. I thought Rust-oleum should fix it but, "No!" Funny that, it plugs up anything else I have tried it on. There must be something that seals thoroughly. Question is...
It seems the general consensus is:
1. Printed PLA has microscopic gaps between extruded lines if material;
2. Gaps can be filled by excess extrusion and overrun;
3. Gaps can be filled by application of some impervious substance.
I thought Rust-oleum would do the job. Perhaps there are areas...
Thanks MintJulep. That's certainly a whole lot more overprinting than I have considered. I'll give it a go next time I print a head.
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Artificial Intelligence is no match for Natural Stupidity
I posted this on another forum. I hope no-one minds. No-one on the other forum had any answer. Perhaps someone here will. [thumbsup2]
My current prototyping project involves an air ram which I use as a pump. Its cylinder is drawn copper tube (150mm nominal) and its head and tail are 3D...
Aaaah. Anno Domine there MintJulep. I, too, remember bike pumps. That's what brought it to mind. [bugeyed]
I'll take that as a Probably !
If anyone knows where to obtain ¼"sq felt cord please let me know.
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Artificial Intelligence is no match for...
The trick here is finding someone who will own up to being a manufacturer of nitrile o-ring cord. They seem to maintain a visibility so low that Uncle Google hasn't heard of them! [banghead]
Considering the low working pressure involved would a simple grease loaded felt seal be sufficient...
Fair question, MintJulep.
Answer, it's part of a machine. It has attachments so it can be driven by the machine. Like this - no Cylinder or Spear Yoke shown:
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Artificial Intelligence is no match for Natural Stupidity
Ooops! [purpleface]
I meant cycles per minute not cycles per second!
Having a check on my thinking here. [tongue]
Make that 90cpm.
There may be a problem with the dissipation of friction heat but I haven't noticed any heat buildup in the periods (a minute or so at a time) when I have had the...
Thanks Tmoose. Great suggestions.
FTR: No problem with oil in delivered air (I am not driving a respirator [upsidedown]). Ram stroke is 80mm, rate about 30cps.
Interesting thought about the running surface. I's pursue that.
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Artificial Intelligence...
My pneumatic ram actuator, built for a mechanical model I am making, is made out of what most folks would call plastic. Head, tail and piston are 3D printed in PLA, cylinder and spear are made from PVC water pipe and the O-ring is nitrile. Actually created as an air pump it is functional in that...
Given a lack of response I am re-posting this in the General Forum.
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Artificial Intelligence is no match for Natural Stupidity
My pneumatic ram actuator, built for a mechanical model I am making, is made out of what most folks would call plastic. Head, tail and piston are 3D printed in PLA, cylinder and spear are made from PVC water pipe and the O-ring is nitrile. Actually created as an air pump it is functional in...
Alternative solution, 3DDave:
Use existing (old) manufacturing equipment; retain existing BSP plant; multiply inches in the dimensions by 25.4; redesignate traditional BSP sizes to "Metric Nominal" sizes; display size transfer charts (like the one you linked to - thanks) in all design offices...
Thanks folks.
LittleInch has hit the nail right on the head.
Consider this bit, ... 15mm BSP is the same as a 1/2" BSP. difficult to find a table like you want as nominal versus actual is quite different.
The thing I've found though is that some 15mm fittings seem to be just a little bit...
As one whose working life involved frequent use of BSP Threads I have yet to come to terms with BSP's replacement in a Metric World. I am looking for a chart which gives me Standard BSP sizes down one side and their Metric Replacements down the other.
I'd also like to know if a 15mm BSP thread...
Here's an interesting discussion:
https://www.youtube.com/watch?v=vAW7sBSeYj0
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Artificial Intelligence is no match for Natural Stupidity
I just have this idea that the efficacy of a windmill blade (one of the airfoil section type) would be governed by the ratio between lift and drag. That's true for all the other airfoils I have had anything to do with.
Increasing the number of windmill blades would have very little effect on...
Thanks.
Complication of the hub seems to be the key.
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Artificial Intelligence is no match for Natural Stupidity
O don't have an account with them and there is something wrong with their website so I can't create one. BTW: what does travel have to do with windpower generation of electricity?
And ... no, I did not ask Uncle Google. I went to an Engineering Forum and asked Engineers...
