Tolerances:
The following tolerances are guidelines only. If
more restrictive tolerances are required, define them clearly
and discuss them with us. If possible, a sample assembly
drawing should be supplied to illustrate the use of the part
and the areas where tighter tolerances are required.
When agreement is reached, the drawing of the part becomes
part of the purchase order.
CROSS SECTION TOLERANCES
±
0.031 in. on fractional
dimensions.
±
0.010 on decimal dimensions.
± 1°
on angular dimensions.
STRAIGHTNESS TOLERANCES
(Bow or camber)
0.015 maximum
deviation per foot of length.
TWIST TOLERANCE
1/2° maximum deviation per foot of length.
LENGTH TOLERANCE
For parts 0.026 thickness and heavier.
±
0.015 in. on parts up to 36 in. long.
±
0.030 in. on parts 36 to 96 in. long.
±
0.060 in. on parts
96 to 144 in. long.
(More on longer lengths.)
LENGTH TOLERANCE
For parts 0.015 through 0.025 thickness.
±
0.020 on parts up to 36 in. long.
±
0.047 on parts 36 to
96 in. long.
±
0.093 on parts 96 to 144 in. long.
(More on longer lengths.)
MORE DESIGN TIPS
A few more do's and don'ts which may help
product designers when considering roll forming for a
particular shape.
- Use maximum bend radii permissible. An inside bend radius of
less than the material thickness will lessen roll life and
increase power requirements.
- Design the parts to be as symmetrical as possible to
eliminate twist in the finished part.
- Design parts so that holes, slots and notches are not
distorted due to placement too close to or directly on a bendline.
- Do not ask for tolerances which are closer than necessary.
This will greatly increase the cost of both the tooling and
the finished part.
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