tag:blogger.com,1999:blog-778487044098443919.comments2017-11-14T20:49:10.183-07:00The Homestead LaboratoryJakehttp://www.blogger.com/profile/05302653400986920552noreply@blogger.comBlogger360125tag:blogger.com,1999:blog-778487044098443919.post-90159829230972653332017-11-13T23:14:55.734-07:002017-11-13T23:14:55.734-07:00Hmm...this is a tricky one. The force in play is g...Hmm...this is a tricky one. The force in play is gravity acting downward on the gate, but with torque around the hinges, particularly the bottom hinge. <br /><br />Because of the hinges holding one side in place, gravity tends to deform the gate from a rectangle into a parallelogram with the upper hinge side and the lower outside forming the long axis. Because of this, the general recommendation is, as you say, to have the diagonal brace low on the hinge side so gravity puts the brace in compression. Having the diagonal high on the hinge side would put the diagonal in tension such that the screws/nails are the only thing keeping the gate from deforming. <br /><br />On your gate, however, the bottom brace, being low on the hinge side, will be in compression no matter what the orientation of the top brace is. <br /><br />The way I tend to think about it, though I'm not sure if it's completely correct conceptually, is that for a hinge side-low brace, the weight of the gate above the brace (i.e., what gravity is trying to use to deform the gate) will be transferred toward the hinge side of the gate through the brace (minimizing torque at the hinge), whereas for a hinge side-high brace, the weight of the gate above the brace doesn't get transferred much to the hinge side because the brace is close to parallel with the direction of torque.<br /><br />So for your gate, making the upper brace parallel to the lower brace would transfer a small amount of the gate's weight toward the hinge side at the middle. Transferring weight from the upper outside corner to the middle of the hinge side might reduce the effective torque at the lower hinge some, but because you've still got the bottom diagonal in compression, the overall difference in stabilization is probably minimal. <br /><br />Also, I wouldn't be worried too much about the middle horizontal member rotating out of square with parallel braces, because the bottom brace isn't really pushing it "up" on the outside--the outer part of the gate is pulling it downward and it's resisting. (Consider what would happen if the gate did get deformed into a parallelogram--the middle horizontal member would start to angle downward on the outside and be put in tension.) If anything, a parallel upper brace could help stabilize the horizontal piece a little.<br /><br />One other thing, (this reply is already way too long, so what's one more paragraph?): for doors that are hung from the top instead of hinged at the side (e.g., sliding barn doors), perpendicular upper and lower braces are more common, since there aren't any compressive-tensile advantages to be had from gravity and the horizontal axis of symmetry looks nicer. :-)<br /><br />An analysis of the stabilizing effects of the different brace types would be interesting. I also haven't drawn a free body diagram since undergrad physics classes, but I do still have my textbook...and an architect friend I should catch up with. Hmm...Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-27423723541347043362017-11-13T21:37:27.559-07:002017-11-13T21:37:27.559-07:00The most applicable article I could find is this o...The most applicable article I could find is <a href="https://skipthepie.org/vegetables-and-vegetable-products/kale-raw/compared-to/amaranth-leaves-raw/" rel="nofollow">this one</a>, which compares amaranth and kale greens, but it has the %RDV much lower for vitamin C. Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-53656515360316195292017-11-13T21:14:31.930-07:002017-11-13T21:14:31.930-07:00In the third-to-last line, x and L2 cancel, so you...In the third-to-last line, x and L2 cancel, so you're left with an equation to solve for (theta2 - theta1) using only w and z. Theta1 you get from the second line. Then, once you know theta1 and (theta2 - theta1), theta2 is just the sum of those two angles. To get x and y, you can go back and substitute in the equations on the third line.Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-11718570081904472332017-11-01T01:20:40.835-06:002017-11-01T01:20:40.835-06:00Great postGreat postJason D. Guajardohttps://www.blogger.com/profile/14532264814565369687noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-62878213648567915582017-10-07T16:15:57.740-06:002017-10-07T16:15:57.740-06:00I long for your new posts. I long for your new posts. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-6899033857962928212017-09-01T16:16:33.185-06:002017-09-01T16:16:33.185-06:00Delicious idea.Delicious idea.Kayhttp://homeandsocietycommunity.blogspot.com/2016/11/review-of-rinnai-rl75in-natural-gas.htmlnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-25548490357371212732017-08-10T12:02:55.737-06:002017-08-10T12:02:55.737-06:00Thank you for all this work! We eat Amaranth green...Thank you for all this work! We eat Amaranth greens. How does it rate?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-49017855926648385322017-07-29T23:30:38.416-06:002017-07-29T23:30:38.416-06:00Do you still have this available?Do you still have this available?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-16514449681484254202017-07-29T16:07:56.222-06:002017-07-29T16:07:56.222-06:00Thanks for the formulas, but I think I'm missi...Thanks for the formulas, but I think I'm missing an equation in Case 2. How can you calculate theta2 without knowing x and y? Elliehttps://www.blogger.com/profile/05575648332273605057noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-73424388083743241932017-07-13T14:12:20.672-06:002017-07-13T14:12:20.672-06:00Do you happen to have an updated link for the Exce...Do you happen to have an updated link for the Excel-based calculator that you mentioned?Robert Malinowskihttps://www.blogger.com/profile/07924559852173592251noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-24944355146410379782017-04-07T14:36:44.309-06:002017-04-07T14:36:44.309-06:00Hi,
I am making a wire gate with a wooden (2x2) f...Hi,<br /><br />I am making a wire gate with a wooden (2x2) frame. The gate does not have two halves that swing separately, but it will have a horizontal cross-member halfway up. It will also have a diagonal brace from a top corner to the midpoint of the opposite vertical, and a diagonal brace from a bottom corner to the midpoint of the opposite vertical (both diagonals meet the middle horizontal member).<br /><br />My question is: should the top diagonals be parallel, or "oppose" one another? I am wondering how to correctly analyze the forces at play. I remember doing force vector diagrams in physics classes to describe situations like this, but can't remember quite how to go about it. Intuitively, I think they should not be parallel, but the few photos of examples of this gate construction have shown parallel diagonal braces. I think they should oppose because they will meet at the same end of the middle horizontal. If the vertical part of the force vector along the lower diagonal pushes up on the end of the middle horizontal member, and the the vertical part of the force vector along the upper diagonal pushes down on the SAME end of the middle horizontal member, it would seem to me that they cancel one another in a very stable way. Whereas if the two diagonals are parallel, the lower diagonal will push up on one end and the upper diagonal will push down on the the OPPOSITE end of the middle horizontal member, potentially inducing it to rotate, make it much less stable. That is where my intuition stems from, but I don't know if it is mathematically complete, especially as it does not consider the outside forces on the door.<br /><br />I have also read that a diagonal brace should start at the top corner opposite the hinges (as in your example photo). I wonder why this is? The answer to this question might help with understanding how to apply the external forces on the the diagonals to analyze whether parallel or opposing is better.<br /><br />Lastly, it would be interesting to go into a similar comparison of the effectiveness/stability/stiffness of the three choices of brace that you talk about...<br /><br />Thanksblankhttps://www.blogger.com/profile/00616611206432721355noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-65991920161206021852017-03-13T17:33:50.088-06:002017-03-13T17:33:50.088-06:00Beauty! Love your pics and thanks for sharing the ...Beauty! Love your pics and thanks for sharing the process - i'm inspired!Delaney Dayshttps://www.blogger.com/profile/17258155445763131029noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-13043130488893048302017-01-26T19:29:08.080-07:002017-01-26T19:29:08.080-07:00I put meat scraps, feathers, small bones, and unus...I put meat scraps, feathers, small bones, and unused entrails in a bokashi composting bin. Larger bones are first used for soup stock then burned for bone ash used as fertilizer.Nergathhttps://www.blogger.com/profile/00030443240833508815noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-30261467165443344642017-01-10T05:46:21.837-07:002017-01-10T05:46:21.837-07:00That's nice and clear, thanks. Shame your shee...That's nice and clear, thanks. Shame your sheet seems to have gone missing in the meantime. Could you repost/update it?sjoerd oostdijckhttps://www.blogger.com/profile/02822326880088214167noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-74340569068255389922017-01-07T00:08:56.436-07:002017-01-07T00:08:56.436-07:00Your garden' design is very simple. You can se...Your garden' design is very simple. You can see beautiful design in web and use for redesign it.خواص آویشنhttp://www.noavard.co/خواص-آویشن-10-خاصیت-آویشنnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-11199852566823206952016-12-25T12:37:38.583-07:002016-12-25T12:37:38.583-07:00I was trying to save up enough dried onion to make...I was trying to save up enough dried onion to make my own onion powder but as I was only saving onion bits and pieces from my cooking it was taking forever. Then I noticed my dried green onions that I had made a year before which I never used and thought "hey these are onions... would this work" and voila it did. I needed onion powder that day as I was making home made Worcestershire sauce. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-53718046685365987392016-12-18T15:42:01.492-07:002016-12-18T15:42:01.492-07:00Better use a stone made mortar only since there is...Better use a stone made mortar only since there is a proof that contact with a metal diminishes ionization of calcium in eggshells Eddie Moorhttps://www.blogger.com/profile/09192670524749044623noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-80762189938449360032016-12-14T16:28:12.396-07:002016-12-14T16:28:12.396-07:00Same here!Same here!Unknownhttps://www.blogger.com/profile/09682378542028521694noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-7068515543670009412016-08-31T15:22:27.932-06:002016-08-31T15:22:27.932-06:00Have you heard of the trick using water, soap and ...Have you heard of the trick using water, soap and a dryer sheet? I imagine it has to do with the positive static charge on the sheet but I'd love it to be analyzed properly<br />Unknownhttps://www.blogger.com/profile/15803824040978249919noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-68202968698696871092016-08-19T01:20:21.881-06:002016-08-19T01:20:21.881-06:00Yep, we figured that out quickly. :-) Note the edi...Yep, we figured that out quickly. :-) Note the edit that we're using paper towels instead these days.Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-10882026915879452072016-08-16T16:05:49.458-06:002016-08-16T16:05:49.458-06:00Cardboard isnt a great choice as first bedding as ...Cardboard isnt a great choice as first bedding as when it gets wet it can get quite slippy and can cause issues with their feet, try an old towel or some cheep rubber mat.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-19830886413162969012016-08-08T23:29:45.063-06:002016-08-08T23:29:45.063-06:00The sides of the brace are parallel and the diagon...The sides of the brace are parallel and the diagonal z transverses them, so the alternate interior angles are congruent. <br /><br />In the picture inset, you can see the alternate interior angle of X; think of drawing theta2 downward from the opposite side of the brace (i.e., across the brace), and hopefully it will be easier to visualize!Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-24388895731139457632016-08-08T23:10:49.949-06:002016-08-08T23:10:49.949-06:00I suppose with all the time you save, you could do...I suppose with all the time you save, you could do math!<br /><br />But you're right, there are tools to make the job go quickly so you can move on to the next project. There's definitely no shortage of work to go around!Jakehttps://www.blogger.com/profile/05302653400986920552noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-13895731452741458352016-07-20T18:10:22.861-06:002016-07-20T18:10:22.861-06:00coffee grinder full speed and shake rapid
coffee grinder full speed and shake rapid<br />Unknownhttps://www.blogger.com/profile/05281189219406553759noreply@blogger.comtag:blogger.com,1999:blog-778487044098443919.post-83447017876328672522016-07-11T02:00:57.409-06:002016-07-11T02:00:57.409-06:00In case 2, how do we know that
angle X = theta2 ...In case 2, how do we know that <br /><br />angle X = theta2 - theta1 ? Anonymousnoreply@blogger.com