Helix Part
- Thread starter lamar
- Start date
Lew_Merrick
Guest
Lamar,
The (PDF) sketch is far from complete. What size wire/rod is being used here? The angle between the two 2.02 (inch) legs is defined by two non-true projection angles (164.4° & 160.0°). The .44 (inch) offset dimension in the main view appears to project from the edge of the wire to the corner (not insolvable, just a PITA). The 2.02 (inch) "leg" nearest the helix (suggested to be a nominal 134° sweep -- but not given in true projection) is the basis alignment in the sketch which implies that it is the critical alignment for the part -- but this is implied without being stated.
Merrick's Law of Drafting is that no drawing is complete without a missing dimension. The person providing you this drawing carried that to completion...
The (PDF) sketch is far from complete. What size wire/rod is being used here? The angle between the two 2.02 (inch) legs is defined by two non-true projection angles (164.4° & 160.0°). The .44 (inch) offset dimension in the main view appears to project from the edge of the wire to the corner (not insolvable, just a PITA). The 2.02 (inch) "leg" nearest the helix (suggested to be a nominal 134° sweep -- but not given in true projection) is the basis alignment in the sketch which implies that it is the critical alignment for the part -- but this is implied without being stated.
Merrick's Law of Drafting is that no drawing is complete without a missing dimension. The person providing you this drawing carried that to completion...
neilr
Senior Member
I haven't had a chance to dig into it yet but the one thing I noticed is that in the pfd the axis for the spiral is at an angle and that might be what is throwing you off. I will see if I can figure it out but I wouldn't be suprised if someone else doesn't come up with the answer before I do 