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Feb 27, 2020 - 3:25:13 AM
7 posts since 10/31/2016

Hi Everyone. I am planning - have already started - to build a short scale tenor banjo, for irish music.
I plan to make the tension ring and brackets from brass using Rudy's scheme for the brackets. Can anyone tell me what grade of brass I should use? Most of the online suppliers in the UK sell CZ121 - is this suitable?
Many thanks in anticipation.

Feb 27, 2020 - 3:33:06 AM

2799 posts since 2/18/2009

I use C360 brass, which is very common over here. I haven't heard of CZ121 before, but I imagine there may be different names in UK and US use.
Zach

Feb 27, 2020 - 4:04:24 AM

rmcdow

USA

806 posts since 11/8/2014

Cz121 has about 3% less copper than 360 brass, replacing it with more zinc, same amount of lead. The additional zinc gives it a lower tensile strength than 360, but it will be fine for banjo hardware, and probably a bit more free machining than 360.

Feb 27, 2020 - 6:53:36 AM
Players Union Member

rudy

USA

14988 posts since 3/27/2004

quote:
Originally posted by Jezzer

Hi Everyone. I am planning - have already started - to build a short scale tenor banjo, for irish music.
I plan to make the tension ring and brackets from brass using Rudy's scheme for the brackets. Can anyone tell me what grade of brass I should use? Most of the online suppliers in the UK sell CZ121 - is this suitable?
Many thanks in anticipation.


The latest version of "Fabricating Raw Brass Shoes" can be found as a pdf in THIS archived topic.

Feb 27, 2020 - 7:26:42 AM

Jezzer

UK

7 posts since 10/31/2016

quote:
Originally posted by rmcdow

Cz121 has about 3% less copper than 360 brass, replacing it with more zinc, same amount of lead. The additional zinc gives it a lower tensile strength than 360, but it will be fine for banjo hardware, and probably a bit more free machining than 360.


Thanks for the info. Will the CZ121 be strong enough for the tension hoop after I have cut the slots for the hooks?

Feb 27, 2020 - 7:30:37 AM

Jezzer

UK

7 posts since 10/31/2016

quote:
Originally posted by rudy
quote:
Originally posted by Jezzer

Hi Everyone. I am planning - have already started - to build a short scale tenor banjo, for irish music.
I plan to make the tension ring and brackets from brass using Rudy's scheme for the brackets. Can anyone tell me what grade of brass I should use? Most of the online suppliers in the UK sell CZ121 - is this suitable?
Many thanks in anticipation.


The latest version of "Fabricating Raw Brass Shoes" can be found as a pdf in THIS archived topic.


Thanks Rudy, I have already downloaded the Pdf. I like your methodology and will unashamedly copy it!

Feb 28, 2020 - 2:11:30 AM

rmcdow

USA

806 posts since 11/8/2014

quote:
Originally posted by Jezzer
quote:
Originally posted by rmcdow

Cz121 has about 3% less copper than 360 brass, replacing it with more zinc, same amount of lead. The additional zinc gives it a lower tensile strength than 360, but it will be fine for banjo hardware, and probably a bit more free machining than 360.


Thanks for the info. Will the CZ121 be strong enough for the tension hoop after I have cut the slots for the hooks?


Yes it will

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