Can't get the correct bend allowances . . .
Can't get the correct bend allowances . . .
(OP)
For the longest time I just left the bend allowance alone when making a sheet metal part, because it looked nice enough. Anyhow, I know I'm supposed to make an excel table to use as a bend table, but I can't seem to get it right. Does anyone know a link to step-by-step instructions, or have the time to walk me through it? I can't find any detailed troubleshooting on my problem in any of the SW guides or anywhere else. K-Factor just isn't cutting it anymore.
Thanks gents.
-Cheers
Thanks gents.
-Cheers






RE: Can't get the correct bend allowances . . .
If this information is going to be used for vendor work, the best thing to do is to get with yor vendors and find out what they use.
"The attempt and not the deed confounds us."
RE: Can't get the correct bend allowances . . .
-Greg
"I am the Alpha and the Omega" ~Xenogears
RE: Can't get the correct bend allowances . . .
Any info gladly appreciated.
RE: Can't get the correct bend allowances . . .
program files/solidworks/english/sheetmetal bendtables
there is a bend deduction chart and a bend allowance chart available. The numbers all just depend on your bending. I hope I can be of some more assistance.
RE: Can't get the correct bend allowances . . .
Is there any chance , any of you would be willing to share your findings or spreadsheets with me , as I can test them daily in our environment , and maybe someday get closer to a definitive answer . If this is not possable , because you have policy that doesnt allow you to share this info , I understand , and forgive me for asking . But like all of you , I'm sure , my goal is to just make everyday routines , easier so I can address other fires that will , without a doubt crop up !
RE: Can't get the correct bend allowances . . .
Bend allowance =
(.01743xIR)
+
(.0078 x T)
x
Angle
IR=inside radius
T=thickness of material
This is very accurate for our brakes but I know every shop seems different as on several occasions we have gotten so busy that we had to outsource things to 2 other sheetmetal shops in town and neither could use the same flat size as us.
RE: Can't get the correct bend allowances . . .
RE: Can't get the correct bend allowances . . .
Program Files\SolidWorks\lang\english
You should see a sample bend deduction table. You can make a copy of that and then enter your numbers/formulas for your tooling, save it in this same area. Then when you have a part go to the sheetmetal properties and pick your new bend table.
You will need a different table for each kind of material (crs, s/s, alum etc.)
Feel free to email me if you need more help.
bcolley@dawsonmetal.com
-Brooke
RE: Can't get the correct bend allowances . . .
RE: Can't get the correct bend allowances . . .
Someone emailed me yesterday with questions regarding this thread. I was just getting ready to leave for the night. My intentions were to send a reply this morning. When I got to work I found out that work was done on our network last night and my inbox was deleted!! So I'm sorry that I can't email you back, please re-send your question!
Brooke
RE: Can't get the correct bend allowances . . .
Can anybody give me an idea to use rip for legacy data in solidworks? Most of the times it fails. Any alternative methode will be appriciated.
Swapnil.
RE: Can't get the correct bend allowances . . .
We are now looking into Bend Tables. From what I under stand, you need different tables based on material (SST, HRPO 1008, CRS 1018, SST 304).
What about different tables based on bends that are obtuse or accute?
What about a model that has bends that are obtuse and accute? Can you apply several different bend tables to the same model?
Thanks all.
Wanna Tip? FAQ731-376
"Probable impossibilities are to be preferred to improbable possibilities."
RE: Can't get the correct bend allowances . . .
What do you mean, "k-factor is no longer giving us accurate results that were appearently acceptable in the past"? Are the parts not correct, or is SW not calculating correct values per the thickness, radius, K-factor, and angle?
I just ran a series of tests comparing the SW calculated values to the values calculated by hand using Allowance=(180/pi*angle)*(R+k*T). I ran through numerous combinations of angle, thickness, radius, and K-factor. No errors.
Perhaps something is amiss with your tooling or material. Grain direction, perhaps?
RE: Can't get the correct bend allowances . . .
Apparently, for thhe last several years (at least 18 months) the guys programming from our flatpattern DFXs have been "tweaking" the DXFs so the parts will be made correctly. I'm not sure why they never bothered to tell us.
Anyways, this SM Supervisor gave us a value of .430 to use a k-factor, saying it was generic enough to use with all materials and bend radii. Later, (maybe 3 years ago) this value was updated to .434. It was suppose to be "more better".
Fast-forward to today, and for some reason, if they don't tweak out flat patterned DXFs, we'll have errors of up to 1/8 on a part. The feeling is k-factor is too generic, and we would be better off using Bend Tables.
Wanna Tip? FAQ731-376
"Probable impossibilities are to be preferred to improbable possibilities."
RE: Can't get the correct bend allowances . . .
Deleted messages are sent to the Deleted Items folder. They are not removed permanently unless they are deleted from the Deleted Items folder.
Bradley
RE: Can't get the correct bend allowances . . .
3/4 of all the Spam produced goes to Hawaii - shame that's not true of SPAM also.......
RE: Can't get the correct bend allowances . . .
1) Do I need a seperate bend table for obtuse and accute bend angles?
2) Can I apply more than 1 bend table to the same model with sheet metal features?
My company has stayed current with subscription since SW96+. Well worth the trouble.
Wanna Tip? FAQ731-376
"Probable impossibilities are to be preferred to improbable possibilities."
RE: Can't get the correct bend allowances . . .
htaed@comcast.net
RE: Can't get the correct bend allowances . . .