Tapers

Question 1

What is a machine shop example of a slow taper?

Answer 1

-Morse Taper (think lathe tailstocks)
-Taper Pin (self holding taper)

Morse Taper ratio: 5/8” per foot
Taper Pin ratio: 1/4” per foot

Question 2

A slow taper is __ degrees or less.

Answer 2

A slow taper is 3 degrees or less.

Question 3

What is a machine shop example of a Fast Taper?

Answer 3

Milling machine spindle. (Driven by dogs, not taper)

Question 4

What is a Taper Pin?

Answer 4

One of the slow tapers or “self-holding” tapers used in machine assembly.

Taper Pin ratio: 1/4” per foot

Question 5

Review TPF calculations

(James to provide formulas - not on trig (soh cah toa))

Answer 5

TPF = ((D-d) / length of taper) x 12

Question 6

How do you know if you have a fast taper?

Answer 6

Taper angle measures 3* or greater

Question 7

Review tailstock offset calculations

(James to provide formulas - not on trig (soh cah toa))

Answer 7

Tailstock offset = (TPF x length of work) / 24

(reminder: length of work is entire piece, not just length of taper)

Question 8

What are some methods for turning a taper? (5)

(sorry prescriptive copy-paste)

Answer 8

1) Grinding and setting a tool bit (for short bevels & chamfers)
2) Setting the lathe compound slide (for short or steep tapers)
3) Tailstock set-over or offset (for long tapers on short stock)
4) Taper attachment on lathe (for long tapers on long stock)
5) Tapered reamers (for finished internal tapers)