wannasteam
Member
- Joined
- Dec 22, 2009
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Hello all
I'm having a go at cutting my first threads in preparation for making the worm gears etc for the PMR Drill press.
First thing was to chuck a piece of brass and practice and make sure I got the gist of the process.
I have used this as my reference http://www.metalartspress.com/60%20degree%20threads.pdf and have got all the preparation re thread pitch, 60 inc angle on the cutting tool, 30 deg offset of the compound etc.
My technique was not as good as thought as I am getting an asymmetrical (for a lack of a better description) thread profile. See attachment.
The other attachment illustrates the configuration of the cross slide and compound.
On a side note, I still don't fully understand the reason for the 30 deg offset of the compound. I just did it.
Any comments from the collective wisdom would be greatly appreciated.
Regards
Joe Pestana
Perth W Australia
I'm having a go at cutting my first threads in preparation for making the worm gears etc for the PMR Drill press.
First thing was to chuck a piece of brass and practice and make sure I got the gist of the process.
I have used this as my reference http://www.metalartspress.com/60%20degree%20threads.pdf and have got all the preparation re thread pitch, 60 inc angle on the cutting tool, 30 deg offset of the compound etc.
My technique was not as good as thought as I am getting an asymmetrical (for a lack of a better description) thread profile. See attachment.
The other attachment illustrates the configuration of the cross slide and compound.
On a side note, I still don't fully understand the reason for the 30 deg offset of the compound. I just did it.
Any comments from the collective wisdom would be greatly appreciated.
Regards
Joe Pestana
Perth W Australia