Halcro, your da vinci link reminded me of this thread.
http://www.audiocircle.com/index.php?topic=97522.0
Would be nice to have this guys freind as a friend.
Brad |
Noticed this thread when it started but didn't give it a read till today. Currently been condsidering a new plinth for a Garroard 301 so it was a great read although a plinthless 301 would not be a great idea but would be easy enough to try with a arm pod.
This thread and the debate within have change my direction some. A removable armboard or arm pod and the decision between the two has been the holdup for me. Over the past few days even before reading this thread I have decided to build multiple plinths for both while the table will be down.
May I recommend you guys take a look at
http://www.emachineshop.com/
Came across this service when noticed it mentioned in the DIY Schroeder thread, another great read BTW.
http://www.diyaudio.com/forums/analogue-source/13372-diy-schroeder-tonearm-11.html#post2242523
I have been using there software for awhile now although haven't had a chance to order anything from them yet. They have forum support and also video tutorials to help get started.
There is allots of benefits in using there software even if you have a local machinest already.
You could build a basic armpod in minutes then view it in 3D. Once comfortably with your design you click proceed/analyze and get any instant quote including shipping and weight!!! This alone make this software great. The site says this will work internationaly too.
Multple of the same design reduce the cost dramitcally, may be a great way to do a group buy. If you only want one item but think there may be interest of someone else that may want to purchase the same design you would order more than one to get the price for your one down then they will stock the remaining for a year. If they don't sell you would be obligated to pay for the remaining but if they do you would receive a percentage of the sale, how cool is that.
Another great feature of the sofware is you can import and export files. You can easily import a .dwg file to get you started if you have some cad designs. For you guys that use a local machinest I would think if you design the part then export it to a cad file it would save you some bucks since your machinest wouldn't have to create the design to enter into his CNC.
Brad |
Halcro, your decription of Corby's armpod stability being questionable due to the amount of cantilevers involded surely contradicts your above response unless I am missing something.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1294870073&openfrom&468&4#468
Brad |
Lew, I agree with you that idlers need a plinth thats why I said it wouldn't be a great idea. Now a idler with a plinth and arm pod that is the question.
Chris, were those email request of guys wanting an arm pod for idlers that were nude or with a plinth?
I'm surprised nobody but Halcro has asked more about the ingenious arm pod Corby made. Think you can get him to elaborate a little more of the breakdow with the micrometer, maybe pics. For most arms, having precision VTA would be a plus.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1294870073&openfrom&370&4#370
Like you said manufactured tonearm prices are expensive especially if you would need more than one.
Couple of fine example of the cheaper ones out there.
http://www.ttweights.com/catalog/item/7725503/8678734.htm
http://www.ttweights.com/new_power_arm_pod.html
Notice the second one with the dissimilar materials stainless, lead and derlin. I'm sure this was tried and tested so something to note that there is probably some canceling going on there.
Other than cancelation going on lead would add mass while the derlin should be easy to machine.
Brad |
Halcro, the size of your pod (180mm x 360mm cutout the side with 55mm hole for tonearm) is why the cost is so much to machine. What is the height?
Building one similiar to ttweight is more inline of the cost of your casting. |
Corby, maybe a lead ring at the base would help the problem with your panzerholtz pod.
Do you have any breakdown pocs of your adjustable pod?
Brad |
Lewn, my arm pod path would probably not be for the garrard. My 301 is currently in a slate plinth that won't be easily changed to accept another tonearm, the reason for building others to come soon.
Here is the only example of one I ever seen on the net. Is that for a reason is the question.
http://www.theanalogdept.com/stefano_bertoncello.htm
I respect and agree with your opinion but also respect as stated earlier in the thread that it would be hard for me to comment negatively without having a direct experience.
Any of you guys checked out emachineshop yet? It really is a nice piece of softawre even it is only used for drawing and viewing a prototype of anything. I will soon setup my photobucket with a link to some pics.
Brad |
Lew, at the bottom of that link there is a link to his blog with more great stuff.
Brad |
Corby, you explained this in you prvious post to Halcro:
the vta is adjusted using the micrometer ath the top of the post, there is a thumbscrew on the side that you would loosen first, adjust the height and then retighten the screw to lock everything solid. the micrometer has a long rod attached to it that extends to the bottom of the pod. this enables the 1" shaft to be raised and lowered as required.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1294870073&openfrom&373&4#373
Assembly pics if it isn't a problem would give a better visualation on how it all came or goes together.
Is the brass sleve that the brass AX1 armboard just a spacer for the 1" shaft. Aluminum or stailless?
Thanks,
Brad
Another temp option to a lead ring is maybe some duct sealer that could be formed around the bottom. Duct sealer has been used as a diy dampening on speaker frames. It has a mass to it and can be molded similiar to clay. |
Hey Corby, I follow you. It also looks like the micrometer body was machined to screw into the top of the 1" shaft.
If you ever tear it down take some pics.
much appreciated
Brad |
<<I changed it over and over again and checked and double checked against the TT-81 and all the arms I had.
To make it even more difficult.....every arm has a different 'neutral' position from its base mounting as well as different extensions via its VTA adjustment. :^(>>>
Halcro, I feel ya and the end product makes you feel so good, kudos to ya. DIY makes you a appreciate the cost we pay for this stuff to a certain degree, others that don't diy just don't understand.
Brad |
Thanks Corby, the final piece to me figuring your puzzle.
I'm going to draw this up in emachineshop.com to get and idea in cost between stainlees and brass with the adjustable outriggers optional.
It looks like your base is 3"h x 3"od?
Halcro this could be truely universal if there were differant length 1" shafts with differant length micrometer shaft extensions.
Brad |
Nandic, the thought behind the design in something like Halcro and Corby's pod is 80-90% of the work. Even if there is no desire to own a CNC and that is outsourced it is still your mental labor that made it come together.
You are lucky to have a machinist as a friend.
Brad
|
Lew, I'm looking at the the V2D series ball contact, have not purchase them yet. Open the pdf and eBay listing to get a better look. Their description is contradicting in some areas to me so a call to them will be done before purchasing. I like the concept and the price isn't out the box.
Brad |
I spent some time in the room last year at RMAF. There is nothing I can say bad about this table but recall being stunned about the pricetag when hearing it. I was more impressed than not at the craftmanship and sound.
As most know it is hard to truly evaluate one component at these shows, there is just too much going one. I found that rooms that included their own room treatment benifit the most on getting it right then it still cames down to everything in the chain as Thuchan stated.
Halcro, I think the point he was trying to get across was mass is a criteria but the q of the material is more important with a hint on 6061. I mentioned this once in this thread already with TTweights pod using the combination of aluminum, lead and derlin.
Here are a couple of pics I took at RMAF last year of the table. Included one other of a freinds implementation of 6061.
http://s61.photobucket.com/albums/h69/ecir38/Arm%20Pod/Onedof/
Brad |
Banquo363, didn't realize it was adjustable until reading here a few posts back. |
One of the simplest and cost effective approaches I have seen yet.
http://www.bottlehead.com/smf/index.php?topic=1399.0
Brad |
Halcro, I was looking at this easy idea for those to try a remote armpod out which has been promoted here as opposed to your concrete idea. I can see having more sucess with this than the concrete.
Beyond Chris and Corby I don't think there has been any other DIY approaches so far.
Maybe you don't see it but I don't think that Gent would have mounted the tonearm if it wasn't solid or rigid and he solved the mass problem with the addition of lead. It's not the perfect armpod but it did allow him to try his additional tonearm with only a couple hours of work probably with basic hand tools. If a router is in your toolbox the job would be easier and could be implemeted a little better.
Brad |
Halcro, your a tough cookie when an idea is presented that is not yours.
That idea wouldn't pass that test for sure but I was looking at a temp approach for others to test your nude project. I'll let them be the judge if it would be rigid enough to mount a tonearm.
"I have found that a tin of asparagus can form the ideal height for the temporary mounting of an arm :^)"
After seeing that I don't understand why you would feel the need to debunk the idea.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1294870073&openfrom&442&4#442
http://picasaweb.google.com/hfeiner/NUDETURNTABLEPROJECT?authkey=Gv1sRgCLeeoJToqbeJOg&pli=1#slideshow/5511069514869967442
Brad |
Lew, I have been fighting for a solution with my slate plinth in the footers area to combat floor-borne vibrations. There just aren't any in the market that provide the proper height, decoupling, height adjustment, or a way to mount them. I recently discovered these that meet all of the above and will probably buy some in the near future to give a go.
http://www.simphys.com/Pages/isolation%20products.html
A wall shelf would probalby solve the problem but still would like to try these so the plinth alone could do it's job. One of those minuk-k, vibraplane or similiar would be the ultimate.
Brad |
Halcro, Geez I pushed a button there and shouldn't have, I apoligize.
All good points. I'll say it again, the idea wasn't presented as a do all end all pod and thought you took it to the extreme for what it was. Other than that I apreciate your input.
Brad |
