Is it possible to produce a product like this at a reasonable price in order to make it available across all hospitals?

https://www.youtube.com/watch?v=uWjx4yyNPww

]]>https://www.youtube.com/watch?v=uWjx4yyNPww

I have a relatively simple mechanics problem that I am stuck on at work. I need to calculate the force required to lift a bifold door using lift cables.

Background:

Bifold doors are a type of door where the top of the top section is hinged to the header and the bottom is hinged to the bottom half of the door. Lift straps or cables are used to pull the bottom of the door upwards. There are rollers on the bottom of the door that roll up the side of the building as the door opens. I have included a picture pulled from Pinterest for use as a visual reference.

The weight of the door is known (4000 lbs overall) and the height of the door is 20 feet. I've drawn the FBD but am having a difficult time remembering how to calculate the force required to lift based on this information. I've done a summation of forces and my moment equations but what I am coming up with does not make sense. Any assistance would be greatly appreciated. Thanks in advance!

Background:

Bifold doors are a type of door where the top of the top section is hinged to the header and the bottom is hinged to the bottom half of the door. Lift straps or cables are used to pull the bottom of the door upwards. There are rollers on the bottom of the door that roll up the side of the building as the door opens. I have included a picture pulled from Pinterest for use as a visual reference.

The weight of the door is known (4000 lbs overall) and the height of the door is 20 feet. I've drawn the FBD but am having a difficult time remembering how to calculate the force required to lift based on this information. I've done a summation of forces and my moment equations but what I am coming up with does not make sense. Any assistance would be greatly appreciated. Thanks in advance!

I am looking to install a 38" x 38" window in my basement wall. Wall is 92" tall - 38" leaves about 27" top and bottom. Opening will be a little bigger for framing, also I am not looking to cut it all the way up to top of wall, purpose of window is not for egress, it is to let light into bedroom/office.

Now window will be under the single story side of house and figuring the load bearing for sizing header I come up with 3510 LBS. (to get this number I used this website ***link removed***

See snap shot, Also I am located in Brighton Michigan area, snow fall is not that bad,b ut for saftey factor I used heaviest snow fall on calculator.

Now my question is header, I am thinking of using steel C channel (structural) as header 6" x 1.920" flange height x web thick .20" x 48" long. While I know this will work. I know a steel plate would be easier, but how thick or even steel angle say 2" x 2" x 5/16 thk x 48" long.

I am hiring a person to cut wall with chain saw, so he will be cutting lintel at top of window opening just need to figure how big lintel and material to size lintel for.

Below is Basement Dimensions

Now window will be under the single story side of house and figuring the load bearing for sizing header I come up with 3510 LBS. (to get this number I used this website ***link removed***

See snap shot, Also I am located in Brighton Michigan area, snow fall is not that bad,b ut for saftey factor I used heaviest snow fall on calculator.

Now my question is header, I am thinking of using steel C channel (structural) as header 6" x 1.920" flange height x web thick .20" x 48" long. While I know this will work. I know a steel plate would be easier, but how thick or even steel angle say 2" x 2" x 5/16 thk x 48" long.

I am hiring a person to cut wall with chain saw, so he will be cutting lintel at top of window opening just need to figure how big lintel and material to size lintel for.

Below is Basement Dimensions

First: thanks in advance for looking and perhaps responding.

Second: I am not a student.

I need to build a stand 1,000 mm wide 800 mm deep and 500 mm tall. It has to safely support a static load of 600 kg (1,322 pounds). For a safety factor I would like it to be able to hold 1,000 kg (2,204 pounds). My plan is to use 1.5" square tubing (3/16" wall) to build a frame. Cut two rails 1,000 mm long. Join these with three rails, two at each end and one at the mid point. To this I add legs at each corner and add a stretcher at the midpoint of each leg. Also, add a 4" triangular gusset at each of the four corners. Finally, place a 10 mm (3/8") thick plate on top. Everything will be welded together.

I have been reading about deflection of steel, modulus of elasticity, comprehensive strength and more but it is just too much for me. I don't have the math background for these calculations. I believe my design will be more that strong enough but I would like the math to back me up or prove me wrong.

Again, thanks in advance.

]]>Second: I am not a student.

I need to build a stand 1,000 mm wide 800 mm deep and 500 mm tall. It has to safely support a static load of 600 kg (1,322 pounds). For a safety factor I would like it to be able to hold 1,000 kg (2,204 pounds). My plan is to use 1.5" square tubing (3/16" wall) to build a frame. Cut two rails 1,000 mm long. Join these with three rails, two at each end and one at the mid point. To this I add legs at each corner and add a stretcher at the midpoint of each leg. Also, add a 4" triangular gusset at each of the four corners. Finally, place a 10 mm (3/8") thick plate on top. Everything will be welded together.

I have been reading about deflection of steel, modulus of elasticity, comprehensive strength and more but it is just too much for me. I don't have the math background for these calculations. I believe my design will be more that strong enough but I would like the math to back me up or prove me wrong.

Again, thanks in advance.

I am looking for help answering an engineering question. If a vehicle was manufactured in 1986 and the maximum safe operating speed of the vehicle in 1986 was 88km/h or 55mph to reduce the risk of loss of vehicle control due to the design on the vehicle, and the required maintenance schedule was only done at double the recommended intervals what would the maximum safe operating speed of the vehicle be in 2017. 31 years later.

As well if the recommended maintenance intervals were every 5,000 kms should the maintenance intervals be performed at an earlier km amount and if so what would that amount be 31 years later.

Thank you in advance for your assistance with this.

Carolle

]]>As well if the recommended maintenance intervals were every 5,000 kms should the maintenance intervals be performed at an earlier km amount and if so what would that amount be 31 years later.

Thank you in advance for your assistance with this.

Carolle

Hi,

I'm specifying wire ropes to replace existing wire ropes used to suspend heavy counterweights for a movable bridge. The wire ropes will be fabricated per ASTM A1023. Do all wire ropes have a certificate or is a certificate only available upon request? And who certifies the wire ropes....rope manufacturers themselves or by an independent third party verification? How do I make sure that the rope manufacturer will fabricate the wire rope per ASTM standards?

I know in HVAC, we can get independent Testing, Adjusting, and Balancing (TAB) specialists that are certified by organizations, such as AABC, NEBB, or TABB to perform the work. Is there something similar for wire rope testings and verifying?

Thanks.

]]>I'm specifying wire ropes to replace existing wire ropes used to suspend heavy counterweights for a movable bridge. The wire ropes will be fabricated per ASTM A1023. Do all wire ropes have a certificate or is a certificate only available upon request? And who certifies the wire ropes....rope manufacturers themselves or by an independent third party verification? How do I make sure that the rope manufacturer will fabricate the wire rope per ASTM standards?

I know in HVAC, we can get independent Testing, Adjusting, and Balancing (TAB) specialists that are certified by organizations, such as AABC, NEBB, or TABB to perform the work. Is there something similar for wire rope testings and verifying?

Thanks.