Morse tapers

[brickyParticipant @bricky]

Could someone inform me of the height of gauge blocks needed for a 5"sine bar for a 2 morse and 4 morse taper, as I am not makeing much sense of the sine bar calculators on the net.I want to make an angle plate for both tapers so that I can set the bar on my taper turning attatchment.

[brickyParticipant @bricky]

[not done it yetParticipant @notdoneityet]

Try this one.

**LINK**

insert angle and length of sine bar (select inch option)

pressing submit will give you your answer (and more info)

[Chris Evans 6Participant @chrisevans6]

If you have metric slips multiply sine x 127 for 5" sine bar.

[BazyleParticipant @bazyle]

Look up the taper per inch on the internet. You should find some tables that give the taper per inch, which is the taper for both 'sides' so twice the amount you want so divide by 2.
That is per inch but you have 5 inches – so multiply by five.
No 2 is easy 0.05 per in >> 0.125 gauge block.
No 4 is nearly the same, 0.0519 >> 0.13 gauge block.

Now if someone wants to quibble that the 5 in is along the hypotenuse you are right but the difference is in the tenths and I don't have tenths shims.

You almost feel they made the No 2 a clean round figure then when making the No 4 it was after lunch and a sandwich crumb got squished under the block.

[not done it yetParticipant @notdoneityet]

You will be out by 38 thous in that 5”, so I think you might be a whole thous out on your result🙂

edit – I actually checked – only 2/10s out.

Edited By not done it yet on 27/03/2020 20:12:31

[David CauntParticipant @davidcaunt67674]

Back at school 63 years ago it was the mnemonic "Silly Old Harry" Sine of the angle = Opposite divided by the Hypotenuse.

Therefore Opposite = Hypotenuse X sine of morse taper angle

Where Opposite is your block height.

MT2 = 1.4307, MT4 = 1.4876.

For MT2 block height = 5" * sine 1.4307 = 0.12483915376791831054202224797354‬"

For MT4 block height = 5" * sine 1.4876 = 0.1298030051564469002522710354277"

Good look with that.

[BazyleParticipant @bazyle]

Again if you look at my post you see how easy it can be when not using sines etc. There are reasons why before computers they specified tapers as per inch or per foot and not by angles.

[brickyParticipant @bricky]

Thanks to all who have responded,I can get on with the job now.All of you stay well in these trying times.

Frank

[David CauntParticipant @davidcaunt67674]

Bazlyle

We did have slide rules though and they did sin/cos/tan etc.

Dave

[Nigel (egi)Participant @nigelegi]

 

Just thought I would copy this table in from my page on this subject to complete the list:

Morse Taper No.	Gauge Depth (inches)	Gauge Diameter (inches)	Hang (inches)	Taper per inch	1/2 included angle °
0	2	0.252	1/8	0.05205	1° 29′ 30”
1	21/8	0.369	1/8	0.04988	1° 26′
2	29/16	0.572	3/16	0.04995	1° 26′
3	33/16	0.778	3/16	0.05020	1° 26′ 15”
4	41/16	1.02	1/4	0.05194	1° 29′
5	53/16	1.475	1/4	0.05263	1° 30′ 30”
6	71/4	2.116	5/16	0.05214	1° 30′
7	10	2.75	3/8	0.052	1° 30′

Edited By JasonB on 28/03/2020 06:50:56

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