Premium Members Eric Fletcher S.O.C. Posted June 8, 2011 Premium Members Report Share Posted June 8, 2011 500,000 (OD^4 - ID^4) K (lbs/in) = -------------------------------------------------- (0.4244 x A^2 x B) + (0.2264 x C^3) Best. Equation. Ever. (for those viewing smilies) Yeah I fixed that Quote Link to comment Share on other sites More sharing options...
Premium Members Jens Piotrowski SOC Posted June 9, 2011 Author Premium Members Report Share Posted June 9, 2011 "The three notches in the carbon fiber post are a HUGE structural no-no, carbons strength is from it's long chain molecular structure, break that structure and those layers are only unnecessary weight which again is in the carry structure " that's why the inner post is much thicker than usual to compensate for that "loss" and btw the whole post is just 740 grams in total..... Eric, how heavy is the standard XCS post 19"-31" ? Quote Link to comment Share on other sites More sharing options...
Premium Members RonBaldwin Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 God...I got into this biz to get away from equations. I will have to see both side by side and shake them to see for myself. And I'd also like to compare the connectors and see what is going on there too. Quote Link to comment Share on other sites More sharing options...
Premium Members Jens Piotrowski SOC Posted June 9, 2011 Author Premium Members Report Share Posted June 9, 2011 God...I got into this biz to get away from equations. I will have to see both side by side and shake them to see for myself. And I'd also like to compare the connectors and see what is going on there too. Hi Ron, I don't really think you can compare the two (XCS) since one costs 17k and the other one starts at 27K..... As I said it's a good lower cost alternative for people especially in Europe...... Quote Link to comment Share on other sites More sharing options...
Premium Members James Davis Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 Price wise it's closer to an Archer 2 sled than it is to the XCS, and it's certainly looks to be a nice alternative. Quote Link to comment Share on other sites More sharing options...
Premium Members James Davis Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 Ok....I didn't realise that the $20k figure being thrown around was without monitor or monitor bracket. Still a good price I think, but more in line with big rig prices than an Archer 2 I guess. Quote Link to comment Share on other sites More sharing options...
Premium Members RonBaldwin Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 God...I got into this biz to get away from equations. I will have to see both side by side and shake them to see for myself. And I'd also like to compare the connectors and see what is going on there too. Hi Ron, I don't really think you can compare the two (XCS) since one costs 17k and the other one starts at 27K..... As I said it's a good lower cost alternative for people especially in Europe...... I was really talking about comparing my pro and an xcs as far as the shake test goes -- I know which one will win but I still would like to check it out. $17k is a decent deal if it's a nice sled. I think a pro sled is $22k-ish but as mentioned earlier all the import costs will drive that number up quite a bit. Quote Link to comment Share on other sites More sharing options...
Premium Members Jens Piotrowski SOC Posted June 9, 2011 Author Premium Members Report Share Posted June 9, 2011 God...I got into this biz to get away from equations. I will have to see both side by side and shake them to see for myself. And I'd also like to compare the connectors and see what is going on there too. Hi Ron, I don't really think you can compare the two (XCS) since one costs 17k and the other one starts at 27K..... As I said it's a good lower cost alternative for people especially in Europe...... I was really talking about comparing my pro and an xcs as far as the shake test goes -- I know which one will win but I still would like to check it out. $17k is a decent deal if it's a nice sled. I think a pro sled is $22k-ish but as mentioned earlier all the import costs will drive that number up quite a bit. FYI: no import costs, Sachtler has offices in New York and Burbank, you just pay sales tax.... Quote Link to comment Share on other sites More sharing options...
Premium Members Jerry Holway Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 And FYI A 1.8" post is about twice (207%) as stiff as a 1.5 but a 2" post is over three times (316%) as stiff. Tiffens 1.58" post is only 24% stiffer than a 1.5" post in comparison. Small math lesson: The above percentages are calculated on the OD of the post only; one needs to include the ID in the formula... IF all the walls of the posts had the same thickness and the same Modulus of elasticity (same material, wind of fibers, etc.) then the percentages would be more like 240% for the 2" post vs. the 1.5 inch, and 17% for the 1.58" post vs. the 1.5 inch post. I did not bother to calculate for the 1.8" post. (I based these numbers on a .065" wall, BTW, a different wall thickness would vary the results). It's clear a bigger diameter post is generally better as a structural member, all other things being equal. No argument there. Go bigger yet, and it's more stiff... but there is a point of diminishing returns here - how big is big enough? And there are some other operating and weight consequences of going too big. Or just preferences... Regardless, we do not know several things about each post system: the modulus of elasticity of the material, the ID's, and how the multiple posts interact (combine) for stiffness... So, clearly exactly how stiff a whole system is depends on many factors... and the key question is: does your rig shake while you work?? Jerry Quote Link to comment Share on other sites More sharing options...
Premium Members Eric Fletcher S.O.C. Posted June 9, 2011 Premium Members Report Share Posted June 9, 2011 Regardless, we do not know several things about each post system: the modulus of elasticity of the material, the ID's, and how the multiple posts interact (combine) for stiffness... So, clearly exactly how stiff a whole system is depends on many factors... and the key question is: does your rig shake while you work?? Well actually due to the wind and the modulus of the XCS post it's more like 4times as stiff as say the U2's post but really who's counting... Every time you add a clamp and a section of post you add weight and will reduce stiffness and as I've pointed out you are putting the weight in the wrong location (The carry structure) and honestly the integrated four stage super post doesn't get you any higher or lower than a two stage post and long post arm Quote Link to comment Share on other sites More sharing options...
Moderators Janice Arthur Posted June 9, 2011 Moderators Report Share Posted June 9, 2011 Shouldn't you guys be working for NASA? JA Quote Link to comment Share on other sites More sharing options...
Premium Members Tomas Riuka Posted June 10, 2011 Premium Members Report Share Posted June 10, 2011 Shouldn't you guys be working for NASA? JA Quote Link to comment Share on other sites More sharing options...
Premium Members sasha proctor Posted May 8, 2017 Premium Members Report Share Posted May 8, 2017 I realize this is a really old thread. Does anyone have the exact measurement of this post? It's a European company so I'm assuming it's a precise metric measurement not 1.8" as discussed here. Thanks Quote Link to comment Share on other sites More sharing options...
Premium Members Jens Piotrowski SOC Posted May 8, 2017 Author Premium Members Report Share Posted May 8, 2017 1.8" outer, 1.5" inner post Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.