my latest iteration of "Nanook's 219 tonearm".. - Page 37 - diyAudio
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Old 8th September 2011, 11:37 PM   #361
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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
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Old 27th February 2013, 07:13 PM   #362
MartinG is offline MartinG  United States
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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.
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Old 2nd April 2013, 01:16 AM   #363
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What is the status of the tonearm? Anybody done?
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Old 2nd April 2013, 02:20 AM   #364
Nanook is offline Nanook  Canada
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Default 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/(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
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Old 2nd April 2013, 08:50 PM   #365
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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.
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Old 16th June 2013, 07:40 AM   #366
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Default Nanook's Arm-Question re setscrew

Hi Everyone
Does anyone know what size of setscrew Nanook uses on his arm?
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Old 25th June 2013, 08:03 PM   #367
Jay1234 is offline Jay1234  United Kingdom
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Hi everyone,

Just found this thread.

Can we have a gallery of arms that have been made from arrows.

I have found an Easton hunting arrow in the loft so might as well put it to use....

a few Questions;

Effective Arm lengths ?
Female bearing ?
Type of arm cable ?
Cable exit top or bottom of arm ?
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Old 24th July 2013, 07:52 PM   #368
Jay1234 is offline Jay1234  United Kingdom
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whats happened to this thread

jay
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Old 24th July 2013, 09:18 PM   #369
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I am sure that Nanook will jump in here with info. Lengths vary as longer arms will reduce distortion. I helped Nanook build up one of his arms one evening we used a dead simple chrome plated acorn nut for the female bearing and a ballpoint pen refill for the bearing. I have never seen an arm move freely than that one. You can go fancy but the point is dead simple will stomp on arms which retail new for thousands. Knock one together and start having some fun. You can build one of these on your kitchen table in an hour or two start to finish. Best regards Moray James.
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Old 25th July 2013, 04:55 PM   #370
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I would agree with you. I am using an 8mm grub screw for the 'cup' and it works exceptionally well. Instead of using CF tube, I've used solid oak for the 'wand'-I hope to post some pictures soon. Instead of the ball point I'm utilising a 2mm ball bearing located on top of a 2mm bolt-simple but very effective-watch this space.......
Chris
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