Figure 41. Acme. Square, and 29A Worm Screw Thread Forms.

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for the lathe lead screws and similar power transmitting uses.

FIGURE 41. ACME, SQUARE, AND 29 WORM

SCREW THREAD FORMS.

(5) Twenty-Nine Degree Worm Screw Thread.

The 29 worm screw thread and

the Acme thread are similar in that they both have an included angle of 29

(figure 41). However, these thread forms should not be confused since they

are different in the depth of thread and in the width of the crest and root.

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Index