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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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<blockquote data-quote="marcochezzi" data-source="post: 988760" data-attributes="member: 21001"><p>Right...</p><p></p><p>The pulley....</p><p></p><p>My nemesis...</p><p></p><p>Grief this part made me old, mark my words...</p><p></p><p>Ok, so I need to note that to get to the end, I had to redo the process below some 4 or 5 times, each time a little different, each time a little more frustrating, each time a little closer to the end result, I did not take photos of all that was done, I was too busy crying at my constant failures, and I did not want to cause liquid damage on my phone...</p><p></p><p>So I changed the process of hanging the solution on the head block baseplate altogether..</p><p></p><p>The idea behind this was to make available a longer pulley solution in terms of where the bearings were positioned, therefore if a little play was present, it would not amplify itself by virtue of a hanging hub system as originally designed..</p><p></p><p>So first thing to do was manufacture a small fixed shaft at the correct length. Note the picture below was using the 2nd bearing cap cover I had designed, this was no longer required, just at the time I did not quite figure this out..</p><p></p><p>Note as well that since the shaft is fixed to the chassis and no longer the headblock, the end of the headblock was milled open in order to facilitate removal. </p><p></p><p>Contrary to what might be imagined this does not weaken the headblock, the only reason for the now removed portion was the location and holding down of the exit tape guide assembly, the headblock is plenty strong with significant ribbing on the underside between the 3 mounting screws, which all fall way before the milled area is reached....</p><p></p><p>Naturally, in order to locate the shaft, the chassis needed to be bored, this required very accurate measurements as the shaft also holds the blessed headcover brass nipple, and if that is out of place, the coverplate cannot fit, point....</p><p></p><p></p><p><img src="https://i.imgur.com/9ngDzJC.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="marcochezzi, post: 988760, member: 21001"] Right... The pulley.... My nemesis... Grief this part made me old, mark my words... Ok, so I need to note that to get to the end, I had to redo the process below some 4 or 5 times, each time a little different, each time a little more frustrating, each time a little closer to the end result, I did not take photos of all that was done, I was too busy crying at my constant failures, and I did not want to cause liquid damage on my phone... So I changed the process of hanging the solution on the head block baseplate altogether.. The idea behind this was to make available a longer pulley solution in terms of where the bearings were positioned, therefore if a little play was present, it would not amplify itself by virtue of a hanging hub system as originally designed.. So first thing to do was manufacture a small fixed shaft at the correct length. Note the picture below was using the 2nd bearing cap cover I had designed, this was no longer required, just at the time I did not quite figure this out.. Note as well that since the shaft is fixed to the chassis and no longer the headblock, the end of the headblock was milled open in order to facilitate removal. Contrary to what might be imagined this does not weaken the headblock, the only reason for the now removed portion was the location and holding down of the exit tape guide assembly, the headblock is plenty strong with significant ribbing on the underside between the 3 mounting screws, which all fall way before the milled area is reached.... Naturally, in order to locate the shaft, the chassis needed to be bored, this required very accurate measurements as the shaft also holds the blessed headcover brass nipple, and if that is out of place, the coverplate cannot fit, point.... [IMG]https://i.imgur.com/9ngDzJC.jpg[/IMG] [/QUOTE]
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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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