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gary wrote:BTW that "sine wave" issue (i.e disk or drum wobble) is probably one of the most common problems with "kitchen table" mechanics. It is one area where the use of a lathe is well suited, but it can also be remedied by the use of "off the shelf" hubs etc. Any conical (or self centering) solution is ideal - I think Dr Zarkov's idea of using R/C hubs may fall in to that category.
gary wrote:Yep, that is quite some wave (wobble) you have there - good photos though! I wish I could do as well.
holtzman wrote:Congrats Harry!
I am passing through a hectic period of my life sorry for delay... The wavy pattern you are getting seems to be usual for drum monitor, remember I got it too. It may be caused by several reasons.
First, the drum may be not centered on the shaft.
Second, it may wobble - if mounted not perpendicular to the shaft.
Third, the drum's cylinder surface may be deformed. This was my problem. My drum is very thin and soft, so it got deformed by centrifugal forces, I had to add small weights to balance it.
But my gut tells me your drum just is not centered, try to re-adjust it.
Best luck
Metallica Man X wrote:Looks good! Can't wait to see it in action.
How did you measure out the distance for the magnets to keep it balanced?
Klaas Robers wrote:Harry,
about the wobbly sync-line:
1. your DVD-drum should run smoothly, without radial movements. If you touch the drum gently with your finger while it is running, you should hardly feel it bumping against your finger. So no wobbling of the drum is allowed. Wobbling will introduce wobbly horizontal lines.
2. The distance of the slits on the drum should have equal distances. That is difficult as they should carefully allign a certain number of slits around the drum. Also unequal slit distances around the drum will introduce wobbly horizontal lines as well.
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