drawing thread on end of spindle

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new2QCAD
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drawing thread on end of spindle

Post by new2QCAD » Sun Apr 19, 2015 4:39 pm

USING:
Win 7/32
4g RAM

Version: 3.9.1.0 (3.9.1)
Build Date: Mar 13 2015
Qt Version: 4.7.4
Compiler: MSVC++ 10.0 (2010)

Basically I want to thread end of shaft in Qcad.

Searched under "thread QCAD" and I find plenty of forum "topical threads" about any given topical thread, but nothing about M20 or UNF etc etc threads.

It must be tagged to a menu item which I can't see, but not for want of looking.

Thanks.

Regards,
Kevin

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andrew
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Joined: Fri Mar 30, 2007 6:07 am

Re: drawing thread on end of spindle

Post by andrew » Mon Apr 20, 2015 8:13 am

Perhaps you can find an existing image online to explain what exactly you are trying to draw. There are various ways and standards to depict threads. Google image search might help.

new2QCAD
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Posts: 9
Joined: Wed Mar 18, 2015 9:56 am

Re: drawing thread on end of spindle

Post by new2QCAD » Tue Apr 21, 2015 3:18 am

th.jpg
th.jpg (1.69 KiB) Viewed 3351 times

Hi Andrew,

I have a shaft and I want to thread the smallest journal on the end of this shaft.

More correctly I want to draw the shaft with a thread on the end of it, much like the bolt shown.

Thanks.

Regards,
Kevin

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andrew
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Re: drawing thread on end of spindle

Post by andrew » Tue Apr 21, 2015 8:07 am

Such threads are typically represented as shown below in CAD. But as previously mentioned, there are different standards.
Image

new2QCAD
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Posts: 9
Joined: Wed Mar 18, 2015 9:56 am

Re: drawing thread on end of spindle

Post by new2QCAD » Wed Apr 22, 2015 3:54 am

new2QCAD.png
new2QCAD.png (2.98 KiB) Viewed 3327 times
Hi Andrew,

I want to draw a UNF 60 degree thread form on the end of the spindle.

Regards,
Kevin

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andrew
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Re: drawing thread on end of spindle

Post by andrew » Wed Apr 22, 2015 7:44 am

Have a look at the image I've posted above. That's how you typically represent a thread in CAD. In the dimension label, you then type the specifics about the thread (e.g. M10 for a metric thread with a diameter of 10 or UNF. You also see drawings with a leader pointing to the thread with a label "UNF":
Image

Are you thinking about drawing the actual thread lines? If so, don't. The images I've posted show how to draw a thread in CAD.

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