my latest iteration of "Nanook's 219 tonearm".. - Page 37

Zene Gillette · 8th September 2011, 10:37 PM

All/anyone ... this may have been covered here but would take me a long time to find.
In doing prelim work on a DIY tonearm I noticed a huge calculated difference in shaft mass from 8hz to 11hz (3gms to 12gms) for the cart I plan to use (5.5 gms and compliance of 20). That is a big difference and would like to know which might be better; heavy or light if the material stays the same?
I do know there are many many variables to consider. Two important ones is that the table is fair quality (Audio Linear) and sits directly on fireplace hearth (stomp all you want on floor). Tonearm will sit on hearth also.
Thanks, Zene

MartinG · 27th February 2013, 06:13 PM

I realize that this is an old thread but I went by the local archery supply and asked about shafts today. The guy behind the counter showed me a dozen bins of high performance shafts. When I asked which ones were alu he said "No one uses aluminum anymore". I guess I'll have to order them online. I'd rather not have to fiddle with CF.

audiostar · 2nd April 2013, 12:16 AM

What is the status of the tonearm? Anybody done?

Nanook · 2nd April 2013, 01:20 AM

All: my comp has been down for some time so I haven't been posting much.

MartinG: I use Easton aluminum shafts. Inexpensive and perfect for the application.

for resonance calculations:

Rf=1000/(2*pi*sqrt(M*C))

Rf is resonant frequency
M is total mass of the tonearm (effective tonearm mass, cartridge mass and mass of wiring and fasteners)
C is compliance in dynes

vdi_nenna · 2nd April 2013, 07:50 PM

Quote:

What is the status of the tonearm? Anybody done?

http://www.diyaudio.com/forums/galle...php/photo/8253

Get ideas from "219" thread and other sites as well.

2nd April 2013, 01:20 AM	#364
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	aluminum arrow shafts and resonant frequency calculation All: my comp has been down for some time so I haven't been posting much. MartinG: I use Easton aluminum shafts. Inexpensive and perfect for the application. for resonance calculations: Rf=1000/(2pisqrt(MC)) Rf is resonant frequency M is total mass of the tonearm (effective tonearm mass, cartridge mass and mass of wiring and fasteners) C is compliance in dynes __________________ stew* ☮ -"A sane man in an insane world appears insane."

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8th September 2011, 10:37 PM	#361
Zene Gillette diyAudio Member Join Date: Jan 2004 Location: Washington State	All/anyone ... this may have been covered here but would take me a long time to find. In doing prelim work on a DIY tonearm I noticed a huge calculated difference in shaft mass from 8hz to 11hz (3gms to 12gms) for the cart I plan to use (5.5 gms and compliance of 20). That is a big difference and would like to know which might be better; heavy or light if the material stays the same? I do know there are many many variables to consider. Two important ones is that the table is fair quality (Audio Linear) and sits directly on fireplace hearth (stomp all you want on floor). Tonearm will sit on hearth also. Thanks, Zene

27th February 2013, 06:13 PM	#362
MartinG diyAudio Member Join Date: Dec 2005 Location: Austin, Texas	I realize that this is an old thread but I went by the local archery supply and asked about shafts today. The guy behind the counter showed me a dozen bins of high performance shafts. When I asked which ones were alu he said "No one uses aluminum anymore". I guess I'll have to order them online. I'd rather not have to fiddle with CF.

2nd April 2013, 12:16 AM	#363
audiostar diyAudio Member Join Date: Dec 2006	What is the status of the tonearm? Anybody done?