"Steve W." wrote in message ...

Jim Wilkins wrote:
"Richard Smith" wrote in message
...

Can you sketch?

---------------

If you send me an email I'll attach a photo of the gantry and sawmill.
it's on Google Photos but I don't know how to share it.


Right click on photo, select "Copy link address"
Paste link in new message.
-----------------------------------------
https://photos.google.com/photo/AF1Q...KNJpqIL_Xendex

"Jim Wilkins" writes:

"Steve W." wrote in message ...

Jim Wilkins wrote:
"Richard Smith" wrote in message
...

Can you sketch?

---------------

If you send me an email I'll attach a photo of the gantry and
sawmill. it's on Google Photos but I don't know how to share it.


Right click on photo, select "Copy link address"
Paste link in new message.
-----------------------------------------
https://photos.google.com/photo/AF1Q...KNJpqIL_Xendex

Jim - get an "Error 404" on trying to follow that URL.
Tried immediately to get there and found that problem.
Sorry didn't get back to you immediately.
If U-channels are used symmetrically - back to back or facing - so
that they can't twist (rotate) under loading - that a simple analysis
just using 2nd moment of area, beam metal yield strength and beam
length/support is useful.
That also applies to "L" sections, by the way - facing or
back-to-back. In a "desperate" situation I worked out the strengths
according to Euler-Bernoulli beam and it seemed very right. As the
welder, I made sure the secondary steelwork was less strong (would
warn by taking permanent bend) and less stiff than the "primary"
steelwork - so you sensed the limit - and it worked so well.

If you still would like some additional input / collaboration on this,
we can try again with pix and dimensions.

I've done my best with "ASCII art" to sketch a buttressed bolted
connection.
That only works if the beam is cantilever, with the top in tension and
the bottom in compression.
The wheels of the carriage have clearance under the buttress
arrangement.


_ _
/ |_| \
---------------/--|_|--\---------------

------------------- -------------------

Which I think will be stiff and strong.
You could trap a "hanger plate" protruding out of the top as the
means to suspend the transporter beam.

I hope I have
* understood the situation
* the suggestion is helpful

Best wishes,
Rich Smith

"Richard Smith" wrote in message ...

"Jim Wilkins" writes:

"Steve W." wrote in message ...

Jim Wilkins wrote:
"Richard Smith" wrote in message
...

Can you sketch?

---------------

If you send me an email I'll attach a photo of the gantry and
sawmill. it's on Google Photos but I don't know how to share it.

Right click on photo, select "Copy link address"
Paste link in new message.
-----------------------------------------
https://photos.google.com/photo/AF1Q...KNJpqIL_Xendex

Jim - get an "Error 404" on trying to follow that URL.
-----
I could access it later the day it was posted, but not now. It shows the overall saw and gantry setup though not any detail.

My plan is to sandwich plates between the channels like this: ]|[.
The end plates are the hangers, the central one the splice plus a hanger when the track runs across the storage shed. I'll try single bolts through the web at the joint between the channels and at the outer ends of the splice, to see if the shear and bearing are reasonable.

This is in Courier New 10
_ _____________________ _
|o| / o \ splice |o|
====~~=============,================~~=====
|o o o | o o channels o|
====~~============='================~~=====

"Richard Smith" wrote in message ...

"Jim Wilkins" writes:

---------------

I just found these to study:
https://www.steelconstruction.info/The_Green_Books

"Jim Wilkins" writes:

"Richard Smith" wrote in message ...

"Jim Wilkins" writes:

---------------

I just found these to study:
https://www.steelconstruction.info/The_Green_Books

I regularly use the "Blue Book" for sections.
Didn't know of the "Green Books" for connections. Thanks.

"Richard Smith" wrote in message ...

"Jim Wilkins" writes:

"Richard Smith" wrote in message
...

"Jim Wilkins" writes:

---------------

I just found these to study:
https://www.steelconstruction.info/The_Green_Books

I regularly use the "Blue Book" for sections.
Didn't know of the "Green Books" for connections. Thanks.

------------------------------------

This is very good too:
http://www.boltcouncil.org/files/2ndEditionGuide.pdf

"Jim Wilkins" wrote in message ...

I've returned to the gantry track splice, after fixing the car to pass
inspection and largely completing my taxes.

Have you ever seen a bolted I beam splice with the flanges thickened with
welded plates or such to compensate for the reduction in area at the bolt
holes?

"Jim Wilkins" wrote in message ...

"Jim Wilkins" wrote in message ...

I've returned to the gantry track splice, after fixing the car to pass
inspection and largely completing my taxes.

Have you ever seen a bolted I beam splice with the flanges thickened with
welded plates or such to compensate for the reduction in area at the bolt
holes?

--------------------------

If welding plates on the outside of the channel flanges to thicken and
strengthen them at the central splice is technically (if not economically)
sound, they provide much more thread engagement for splice plate bolts in
tapped holes, that don't interfere with the trolley wheels rolling on the
lower flange.

All the examples I've found of bolted beam splices accept the loss of net
flange area at the bolt holes and instead suggest locating the splices away
from the most heavily stressed parts of the beam.