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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote:
replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. |
#2
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On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson
wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag |
#3
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On 4/3/21 11:47 PM, Clare Snyder wrote:
On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag The pipe, even 2 inch, will sag just from its own weight. -- Bob Nichols AT comcast.net I am "RNichols42" |
#4
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On Sun, 4 Apr 2021 09:36:53 -0500, Robert Nichols
wrote: On 4/3/21 11:47 PM, Clare Snyder wrote: On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag The pipe, even 2 inch, will sag just from its own weight. Sched 40 will sag - sched 80 MIGHT work in 2 inch but not with HEAVY drapery |
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On 4/4/21 4:52 PM, Clare Snyder wrote:
On Sun, 4 Apr 2021 09:36:53 -0500, Robert Nichols wrote: On 4/3/21 11:47 PM, Clare Snyder wrote: On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag The pipe, even 2 inch, will sag just from its own weight. Sched 40 will sag - sched 80 MIGHT work in 2 inch but not with HEAVY drapery A 12 foot length of 2 inch Sched 80 steel pipe would weigh over 60 lbs. That's quite some curtain rod!! -- Bob Nichols AT comcast.net I am "RNichols42" |
#6
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On Sun, 4 Apr 2021 21:19:14 -0500, Robert Nichols
wrote: On 4/4/21 4:52 PM, Clare Snyder wrote: On Sun, 4 Apr 2021 09:36:53 -0500, Robert Nichols wrote: On 4/3/21 11:47 PM, Clare Snyder wrote: On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag The pipe, even 2 inch, will sag just from its own weight. Sched 40 will sag - sched 80 MIGHT work in 2 inch but not with HEAVY drapery A 12 foot length of 2 inch Sched 80 steel pipe would weigh over 60 lbs. That's quite some curtain rod!! But it will support itself and some load over a 12 ft span. (about 1 1/2 times?? as much as sched 40. Just did as bit of investigating and 1 1/4 inch sched 80 should be adequate for a pretty heavy curtain - and weigh about 40 lb? - about 10 lb per meter) will sipport about 30 lb evenly didtributed with about an inch of deflection. Sched 40 will only handle around 20 lb with almost 1 1/2 inches of deflection with a wight of ropughly 30 lb. |
#7
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On 4/3/2021 10:38 PM, Linda Iverson wrote:
What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. "Strong enough"? It depends - it will be strong enough to not fall down, but it will sag. How much sag depends upon the weight of the "heavy velvet drapes" & the diameter of the pipe. If you specify the weight & the maximum sag acceptable, someone here can tell you the pipe size to use. However, heavy drapes and a 12' span mean that the sag will probably be unacceptable for anything but a really big pipe. |
#8
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On Saturday, April 3, 2021 at 7:38:28 PM UTC-7, Linda Iverson wrote:
What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. Strong enough, perhaps, but for sag-resistance you want diameter, but not wall thickness (like a water/air pipe intended for machine-threading the ends). Fence rail items https://www.lowes.com/pd/Vinyl-Coated-Steel-Chain-Link-Fence-Top-Rail/999978242 have less pounds per foot of metal, but are cold-worked steel and should perform acceptably; they join end-to-end (and with a bit of Liquid Nails applied, the joints will be rigid enough for most purposes). Designs of curtain rails of formed sheet metal will allow a 12 foot span, with a brace at 6 feet, that doesn't interfere with the drape support elements (sliding plastic in a steel channel). A central brace in these designs is usually not visible with the curtain closed. |
#9
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In rec.crafts.metalworking, Bob Engelhardt wrote:
On 4/3/2021 10:38 PM, Linda Iverson wrote: What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? If you specify the weight & the maximum sag acceptable, someone here can tell you the pipe size to use. However, heavy drapes and a 12' span mean that the sag will probably be unacceptable for anything but a really big pipe. Or hide the sag with a valance box. Elijah ------ as old fashioned as heavy velvet drapes |
#10
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Clare Snyder writes:
On Sun, 4 Apr 2021 21:19:14 -0500, Robert Nichols wrote: On 4/4/21 4:52 PM, Clare Snyder wrote: On Sun, 4 Apr 2021 09:36:53 -0500, Robert Nichols wrote: On 4/3/21 11:47 PM, Clare Snyder wrote: On Sat, 3 Apr 2021 19:38:26 -0700 (PDT), Linda Iverson wrote: On Friday, August 2, 2019 at 6:18:04 AM UTC-7, Goncalves wrote: replying to mjacobsen925, Goncalves wrote: Really mjacobsen925, a forum is where one asks questions not where one gets censored. -- for full context, visit https://www.polytechforum.com/metalw...pe-639655-.htm What if I just want to use black steel pipe as a curtain rod to hang heavy velvet drapes spanning a window greater than 12 feet long without the need for a center support? I’ll anchor ends using flanges (nipples and elbows) screwed into solid wooden header above window. Seems like it should be more than strong enough for such a girly thing. 2 or 3 inch might work but not 3/4 or 1 inch unless you want them to sag The pipe, even 2 inch, will sag just from its own weight. Sched 40 will sag - sched 80 MIGHT work in 2 inch but not with HEAVY drapery A 12 foot length of 2 inch Sched 80 steel pipe would weigh over 60 lbs. That's quite some curtain rod!! But it will support itself and some load over a 12 ft span. (about 1 1/2 times?? as much as sched 40. Just did as bit of investigating and 1 1/4 inch sched 80 should be adequate for a pretty heavy curtain - and weigh about 40 lb? - about 10 lb per meter) will sipport about 30 lb evenly didtributed with about an inch of deflection. Sched 40 will only handle around 20 lb with almost 1 1/2 inches of deflection with a wight of ropughly 30 lb. That's Euler-Bernoulli beam - very clear and exact. You can have the load it can take and the deflection at that load to great accuracy. If you set-up the load on the finished article, you'd find the deflection matched to within a millimetre or something like that. The end supports cannot be anything like rigid enough against rotation to benefit the load capacity and stiffness against deflection. You've got a "simple supported beam" ("double-supported beam"). A fair and reasonable conservative assumption would be to put the entire weight of the curtain in the middle of the "curtain rail" when doing the Euler-Bernoulli calculation for what tube to specify. So that truly is the "simply supported centrally-loaded beam" case. I do a lot of these calculations. eg. http://www.weldsmith.co.uk/tech/stru...lat_calcs.html Rich Smith |
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