EVOLVE Fabrication - Bend Calibration
Evolve Fabrication Website
Website
https://foresite.evolvemep.com/
Crippa Machine Profiles
The Crippa CNC tube bending machine supports creating bends for several different sizes and types of conduit and pipe. The EVOLVE Fabrication Website maintains profiles for the Crippa CNC. These profiles are used to generate the bend angles and leg lengths to allow the conduit to be bent to match the designed part.
Basic Usage
Startup
- Select Fabrication from the list on the left.
- Select Machine profiles in the upper right.
- Select the Plus to add a new profile.
- Enter a profile name and select the machine you are building a profile for.
- Profile Name: Enter a name for the profile. e.g. Machine Name, Material Vendor, Cold Material.
- Stock Length: 10 or 20 ft conduit
- Material Type and Size, EMT, IMT, RMC, 3/4-4"
- Measured Radius, ZZZ(Link to how to calculate)
- Tooling Radius, Radius for the conduit size as defined in the Tooling.SPF file for you machine.
- Spring back
- Measured Radius
- Elongation
- Bend Positioning
Common Actions
- Create Profile: To create a profile, click the plus icon in the upper left. You can create several profiles for the different machines you have.
- Profile Name: Enter a name for the profile. e.g. Material Vendor, Machine name, Hot day, Cold day
- Material Type: EMT, IMC, RMC
- Material Size: Select the conduit size. 3/4" - 4"
Steps to build a profile
Determine Spring back
With your Example Revit project, send the test bends to Fabrication (link to example revit project) (offset and back to back bends and a saddle for verification)
Select the diameter you would like to create a profile for.
Select the number of bends you would like to use to build your profile. ( I provide, 15, 22.5, 30, 45, 60, 90) but have seen success with as little as (15,30,60,90)
Load the bends to Fabrication.
Bend the bends with the profile being at the default values.
Measure the bend angle for each bend, ensuring you are measuring from the nose to the first bend, not the tail to the first bend, even if the tail is longer and it seems easier, you need to measure the angle from nose to bend.
Do this for all the bends.
Once all the bends are bent and angles measured, enter these angles into the spring back table and save the profile.
Refresh the fabrication app on the Crippa.
Determine Measured Radius
From here forward measure the length of the conduit before you bend. (before bend measured conduit length)
Bend the back to back 90 a second time using the new spring back values.
Verify both angles are correct, ensuring you are measuring from the nose to the first bend. If angles are not correct, adjust the spring back value in the direction necessary to dial in the bend angle. If the bend angle is still below target, decrease the spring back value. If the bend angle is above, increase the spring back value.
Once the bend angles are acceptable: (The closer the bend angle is to exact, the more precise the measured radius will be)
Place the top of the nose end against a flat surface and measure from the flat surface to the bottom of the upper horizontal leg of the conduit.
Reference the MPF / YBC file and look up R102.
Calculate the measured bend radius = (measurement X - R102 ) / 2
Enter the measured bend radius into the profile.
Refresh the fabrication app on the Crippa.
Determine Elongation
From here forward measure the length of the conduit before you bend. (before bend measured conduit length)
Bend each bend a second time. (You can use the back to back 90 you already bent with correct angles and know the before bend measured length.)
Verify both angles of each bend are correct, ensuring you are measuring from the nose to the first bend. If angles are not correct, adjust the spring back value in the direction necessary to dial in the bend angle. If the bend angle is still below target, decrease the spring back value. If the bend angle is above, increase the spring back value.
Once all the bend angles are acceptable:
Measure the length of the conduit. (Square the conduit on a flat surface and measure from the surface to the end of the conduit. Do not measure from across the bends.) (after bend measured conduit length)
(after bend measured conduit length + (120 - before bend measured conduit length) - Revit expected length) / 2 = Elongation
Once all the elongation angles are collected, enter them into the machine profile.
Determine Bend Position Error
The bend positioning error is used to alter the nose length before the first bend to account for error created when loading the conduit.
To determine the bend position error, one must be able to identify the marks on the conduit from the pressure die and the bend clamp. All tooling has a 1/8" spacing between these two pieces of tooling. The Bend position error is going to be the difference between the mark made by the pressure die and the end of the conduit. Generally this is a very small number.
Verify the profile produces parts correctly
Manufacture the 4 point saddle and measure to ensure everything is correct.
