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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: 988738" data-attributes="member: 21001"><p>So what went wrong....??</p><p></p><p>So no matter how hard I tried, I could never get play out of the bearings, which resulted in the pulley wobbling about a few tenths, which is not acceptable..</p><p></p><p>I remachined the pulley out of aluminium, then plastic, then aluminium again, probably around 5 or 6 times, and still just could net get to within spec, the shaft was either oversized, or undersized..</p><p></p><p>Then I remachined the nipple holder cap thing out of aluminium which included a seat on the bottom allowing the cap to be bolted to the headblock, and not the bearing block, this worked fine, but the play thing on the pulled dogged me endlessly..</p><p></p><p>Then the crunch, I had posted this build on facebook in the Studer group if I recall, to which I received a kind reply that I might well run the risk of the pulley not turning because of:</p><p></p><p>A: unsprung weight potentially still being too high</p><p></p><p>B: No enough tape tension on the roller with bearing drag adding to the mix..</p><p></p><p>C: Air cushion on the roller during fast forward or rewind high speeds...</p><p></p><p>Damn, that threw a curveball, so I packed the entire affair up for a while as I no longer had the time due to business commitments..</p><p></p><p>Then Covid came along, and we dried up, and here I am at home bored, so why not finish this little affair - properly...</p><p></p><p>Time to dust off the old tools...</p></blockquote><p></p>
[QUOTE="marcochezzi, post: 988738, member: 21001"] So what went wrong....?? So no matter how hard I tried, I could never get play out of the bearings, which resulted in the pulley wobbling about a few tenths, which is not acceptable.. I remachined the pulley out of aluminium, then plastic, then aluminium again, probably around 5 or 6 times, and still just could net get to within spec, the shaft was either oversized, or undersized.. Then I remachined the nipple holder cap thing out of aluminium which included a seat on the bottom allowing the cap to be bolted to the headblock, and not the bearing block, this worked fine, but the play thing on the pulled dogged me endlessly.. Then the crunch, I had posted this build on facebook in the Studer group if I recall, to which I received a kind reply that I might well run the risk of the pulley not turning because of: A: unsprung weight potentially still being too high B: No enough tape tension on the roller with bearing drag adding to the mix.. C: Air cushion on the roller during fast forward or rewind high speeds... Damn, that threw a curveball, so I packed the entire affair up for a while as I no longer had the time due to business commitments.. Then Covid came along, and we dried up, and here I am at home bored, so why not finish this little affair - properly... Time to dust off the old tools... [/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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