The Secret Society of Lathe Trolls

Yes i have measured the DC resistance of the coil and is 132 ohms here are some specifications of fairchild 541A D.C. Resistance :132 ohms Impedance (Z) at 1 kc/ s :282 ohms Volt-amperes required to cut B.B.C. line-up level at 1 kc/s : 0.49 http://downloads.bbc.co.uk/rd/pubs/reports/1948-32.pdf

hey markrob thanks for your response! I tried to make the measurements that you told me but without any success. The reproduction of 1khz sine wave @ 0db (22 volt) was recorded very low @-30db. is it possible the cutter head to be demagnetized? where is located the magnet on this cutter head? is it ...

Hi lathe trollers, I'm trying to embossing on cd (polycarbonate material i think) with saphire needle (backwards) i think i have found the sweet spot because my silent grooves are totally quiet but the maximum db's of my recordings are -7db to -4db (led meters) when the sound goes to -2db usually th...

sorry for my bad english
i mean what material do you use for embossing

uvoscillator wrote:

Gus wrote:hey uvoscillator nice sound!
what format do you use for embossing?

thanks ! here sounds a bit overmodulated
what do you mean 'format' ?

I can emboss all sizes, just expected how to heat big ones with hot water ))

hey uvoscillator nice sound! what format do you use for embossing? Hi there ! Just receive and done first testing Jerry's steel styli. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=281196676466 I've take cone ones and try to emboss with them. With comparing to sapphire. Anything was done as usu...

i found this video in youtube It is running here from 24V through a Mesa Electronics 7i39 three-phase motor driver The commutation is handled in software, from the output of three hall sensors, with the calculations done in the "bldc" component of LinuxCNC. That is converted to a set of 3-phase PWM ...

Finally i bought an 100V/1-25-2-5-5-10-20W line trasformer R = (V squared) / power. In this case: 10000 /20 watts = 500 ohms here is: http://www.ebay.co.uk/itm/Adastra-100V-line-transformer-1-25-2-5-5-10-20W-/290963159558?pt=LH_DefaultDomain_3&hash=item43bec17a06 i hope this transformer to work prop...

Em has given a calculation for the 100 v line... I'm assuming that your amp has 70 v and 100 v outputs along with the 4 / 8 ohm output... the reading on your head is dc not ac.. AC reading is usually much higher... Given the reading it it a good chance that your head is 500 ohm... the transformers ...

please ignore the 78 rpm stylus is only for my tests

Hope these pictures will help you to find the solution sorry but my camera is not high definition this head is a part of Fairchild 539 lathe i've found it @ ebay us shop for 200 $ without the turntable. right now i'm building the lathe from zero i will upload some images of the progress of the work ...

Hi L.K.R.A! I have a 4/8 ohm brigable amp and i'm planning to use it with a 100v line transformer but i'm not sure how many watts it must be the transformer. As EmAtChapterV said 30W @ 100V = 0.3A into 333Ω - if this is the impedance of the head. The dc resistance of my cutterhead is 131,3 ohm That ...

Hey, EmAtChapterV thank you for your quick response

as you can see in the attachment image the dc resistance of cutterhead is 131,3 ohm

Hi! can i use 100 volt line transformer with my Fairchild 541A cutterhead? or only 70.7 volt line transformer? i found one on ebay http://www.ebay.co.uk/itm/RS-100-Volt-100v-line-speaker-matching-transformer-30w-/281147884784?pt=UK_ConElec_SpeakersPASystems_RL&hash=item4175b844f0 i live in europe an...

It's not mine

http://www.ebay.com/itm/REK-O-KUT-MASTER-PRO-MODEL-M-12-RECORD-CUTTER-SERIAL-27-3-RECORD-LATHE-/380656218210?pt=Vintage_Electronics_R2&hash=item58a0e0f062

I live very near to Columbia factory in Athens,Greece
it was one of the biggest culture crimes because our politicians does not save this historical building...

Hi!
Congrads for this amazing project!
i have a question for you
what kind of needle do you use?