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| Replacement P360 actuators (better diagonals) $5 now! See kowal's posts, page 2. |
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| RobotronNut:
--- Quote from: hypernova on September 25, 2006, 09:09:23 pm ---Anyways, just giving this a friendly bump to remind anyone who's possibly interested. --- End quote --- i'd take 2. thanks. |
| hypernova:
--- Quote ---i think it would be asking way too much from hypernova to stock 3 different sizes, fill mixed orders, take returns, etc. i suggest he offer one size and, if there is interest, also offer kits of the 3 sizes that both kowal and i have made. but you'd have to make your choice up front and not expect him to take returns. would anyone out there be willing to pay for kits of 3 (at 3X the price)? --- End quote --- Indeed. It would also compound the cost factor for each person and me having to figure out what to charge each person. Granted I could do it for you all, but I'm not sure enough people would want to do it to make it worthwhile. I'm pretty confident in your recommendations, RobotronNut, and no one has made any remarks saying they weren't, so I think we're good. |
| hypernova:
I will be getting ready to accept preorders on these things soon. Before I do that, however, I want a general consensus on the type of material we want. Here are some of our options. (There are others, but they cost generally the same, if not within a few cents of each other apiece. I'll also list what emachineshop has written down as each material's general usage. These are based on a quantity of 50, without any kind of extra price for their shipping, or mine. Their shipping is only $5.48 for all these things, so that markup will be minimal, and mine too. See more info down. Aluminum 6351 (Furniture, railings, and architectural applications.) - $4.62 ea. Aluminum 2024 (Screw Machine Products, Aircraft Applications) - $5.17 ea. Steel Carbon Type 1040 (Crankshafts, couplings and cold headed parts) - $5.11 ea. Steel Carbon Type 1055 (Light stressed gears,crank shafts,axles, connecting beams,motor parts, general engg. Work, EN-19 is used for heat treated parts where high tensile and impact are required) - $5.57 ea. Stainless Steel 316 (Food and pharmaceutical processing equipment, marine exterior trim, surgical implants, and industrial equipment that handles the corrosive process chemicals used to produce inks, rayons, photographic chemicals, paper, textiles, bleaches, and rubber) - $7.43 ea. Stainless Steel 430C (Gears, bearings, seats, valves) - $7.32 ea. Steel Type 4340 (Aircraft landing gear, power transmission gears and shafts and other structural parts) - $5.63 ea. Can those regular steel types I also listed be used as well? If so, that opens other options. Knowing that aluminum is generally a weaker metal (or is my mind misinformed by products like aluminum cans and aluminum foil,) regular steel is an option at about a dollar more for each. Even with the stainless steel being about $7.50 each, they'll still not cost anyone more than $10 apiece. Concerning shipping: I planned on shipping these via USPS first class mail, in order to keep that cost down to next to a stamp price. However, I am a bit worried that some orders may be smashed enough to warp the cylinder to the point of being useless, which with our tolerances, means ANY kind of crushing would result in a damaged product. Anyone got any ideas how to ship these via the USPS, but still provide enough security for the items to minimize/eliminate any damage possibilities? I could just say screw it, and ship them in a small box with padding to ensure nothing happens, but that'll add a tad more to the shipping cost. Couldn't be anymore than a few bucks though. What's everyone's thoughts on this? |
| RobotronNut:
w.r.t. material - the actuators are only there to block and unblock an optical path. the only significant stresses or strains they experience are the stress of the spring that holds them in place. i'm not an expert, but i'd think any metal would be plenty strong enough. i chose stainless, because it is the least susceptible to oxidation. i would definitely avoid the non-stainless steels, because they can rust pretty quickly. stainless probably would also be less bothered by shipping in an envelope, but your best shipping option might be the small size prirority mail boxes that you can get free from USPS. |
| hypernova:
I'd hope to avoid priority mail, as that's a $4 charge, compared to about $2 via first class mail. First class can weigh up to 13 ounces however, so including packing materials (whatever they are,) first class may not be an option, but these are practically weightless, so I think 13 ounces should be doable quite easily. --- Quote ---i chose stainless, because it is the least susceptible to oxidation. --- End quote --- Ahh...forgot about that with all the talk about tolerances and pricing. How much would you think oxidation be a factor when these will be exposed to normal air? Although, with humidity obviously different in different regions, especially near coastlines or other large bodies of water, the other options would seem like a bad idea. The lakes and such wouldn't be as bad, and I'm no climatologist or meteorologist, but I would assume any large bodies of water, especially oceans would compromise these things quicker than anyone would like unless they were stainless. |
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