multipliers for three bend saddles using poke thru method

Status
Not open for further replies.
B

bopee923

Member
Location
oceanport, nj.
I've become pretty good at teaching the fine art of bending pipe with a chicago bender. question came up this evening about why the multiplier changes to 3 when using the poke thru method. normally at 2.5 for 22 1/2 over 45 degrees i couldn't answer the question. I hope someone can fill me in. I've been using coxcos electricians guide to bending conduit, but can't seem to get in touch with them. thanks in advance speechless for once lol
 
MiamiValleyelec said:
I’ve never heard of the pole thru method or of the multiplier changing to 3 on a 3 point saddle
Click to expand...
The poke thru method is where the raceway is pushed forward after every bend. Several variations for hand and mechanical benders.
Push or poke thru using center bend can be ran from either direction. Easier to do when you dealing with a saddle close to the end of the raceway. That's just one variation.
 
junkhound said:
Me to, opened this thread as did not know what was being talked about.

'chicago bender' ? is that a cheap bender from Harbor Freight or something else?
Click to expand...
Different names for different benders.
Usually a Chicago refers to a mechanical bender.
Chicago 5100,5500
Greenlee 1800, 1818 etc.

With these type of benders the push through is the way to go. One reason I teach the method for hand bending as a transition to mechanical benders.

I'm thinking the three is a round up versus round down for
1/sin d (22.5).
2.5 is easy to use as is 3.
The difference is an increase in space between centers and a tad more of rise. Use the same shrink which is a rounding method as well.
 

Attachments

  • Screenshot_20240121-102714.png
    Screenshot_20240121-102714.png
    104.4 KB · Views: 5
  • Screenshot_20240121-111258.png
    Screenshot_20240121-111258.png
    117.9 KB · Views: 5
  • Screenshot_20240121-111345.png
    Screenshot_20240121-111345.png
    107.6 KB · Views: 3
  • Screenshot_20240121-112633.png
    Screenshot_20240121-112633.png
    98.3 KB · Views: 5
Tulsa Electrician said:
Different names for different benders.
Usually a Chicago refers to a mechanical bender.
Chicago 5100,5500
Greenlee 1800, 1818 etc.

With these type of benders the push through is the way to go. One reason I teach the method for hand bending as a transition to mechanical benders.

I'm thinking the three is a round up versus round down for
1/sin d (22.5).
2.5 is easy to use as is 3.
The difference is an increase in space between centers and a tad more of rise. Use the same shrink which is a rounding method as well. I
Tulsa Electrician said:
Different names for different benders.
Usually a Chicago refers to a mechanical bender.
Chicago 5100,5500
Greenlee 1800, 1818 etc.

With these type of benders the push through is the way to go. One reason I teach the method for hand bending as a transition to mechanical benders.

I'm thinking the three is a round up versus round down for
1/sin d (22.5).
2.5 is easy to use as is 3.
The difference is an increase in space between centers and a tad more of rise. Use the same shrink which is a rounding method as well.
Click to expand...

Gentlemen, my bad for not calling the bender by its real name (Greenlee 1800). I agree with you, the poke thru method for saddles is the way to go with these types of benders as well as the 555 or even the 854 smart bender. I understand how the multipliers are found and used when bending with a hand bender (2.5).I find using the poke thru method with a hand bender, is the way to go as well .Also, when making a three bend saddle using 30 /15 degree bends instead of using 3.86 for the multiplier we've found 4.5 to be the multiplier for center to center bend marks. I believe you're correct when it offers more space for bend marks. also, adding half the total shrink gets the center spot on every time. Thank you for your time sir, Happy Bending...
Click to expand...
 
When using a 3 point saddle over smaller conduits, I often make my center bend at 30 degrees and estimate my outer bends at 15 degrees. I will increase my multiplier from 2.5 to 3 when I do this but I will still make my outer bends on the arrow and point the head of the bender toward the center bend. This spreads out the bends a little and cuts the total degree of bends from 90 to 60 degrees for fishtape and wire pulling.
 
Status
Not open for further replies.
Top