The Vinyl Circle

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Thumbnail for Fig. 4 - Stiffening struts and rear tower assembly in place - Lower parts of tower assemblies bolt up to the inserts originally used for TT-1 shelf mounting/leveling.
Thumbnail for Fig. 4 - Stiffening struts and rear tower assembly in place - Lower parts of tower assemblies bolt up to the inserts originally used for TT-1 shelf mounting/leveling.
Thumbnail for Fig. 5 - Lower swing platform - bottom view. Inset shows the crude but effective attachment of the pendulum chain lower anchor u-bolts. U-bolts were bent slightly in the upward direction to make a more localized spot for chain ends to settle.
Thumbnail for Fig. 6 - Lower swing platform in place. Each pendulum chain assy has a small turnbuckle, allowing leveling and relative tension adjustments once the full load is in place. Coming up from the platform are threaded rods that will be used to help attach the upper platform.
Thumbnail for Fig. 7 - Riser tubes and bumpers in place. ABS plumbing (sewer) pipe was used. Tubes were cut to uniform length with a miter saw blade clamped on wood blocks at the desired height off of a table top. Space available meant 2 tubes needed to be cut into C-sections.
Thumbnail for Fig. 8 - Completed assembly, minus turntable. Riser tubes place upper swing platform about 1/4 inch above TT-1 frame. Threaded rod tops poke up into available space in bottom of turntable.
Thumbnail for Fig. 9 - Straight face/plan view of completed stack-up.
Thumbnail for Fig. 1 Cross-section view. This drawing is not to scale but shows how the ring clamp functions. Platters specifically made to work with the clamp have an outer diameter that the felt pads on the ID of the clamp slide onto nicely - making that diameter do the centering of the clamp, not the LP edge. The platter also has a bit of a 45 degree guide slope or chamfer. My mod was to add 4 blocks to my undersize platter to make it function like more current platters.
Thumbnail for Fig. 1 Cross-section view. This drawing is not to scale but shows how the ring clamp functions. Platters specifically made to work with the clamp have an outer diameter that the felt pads on the ID of the clamp slide onto nicely - making that diameter do the centering of the clamp, not the LP edge. The platter also has a bit of a 45 degree guide slope or chamfer. My mod was to add 4 blocks to my undersize platter to make it function like more current platters.
Thumbnail for Fig. 1 Cross-section view. This drawing is not to scale but shows how the ring clamp functions. Platters specifically made to work with the clamp have an outer diameter that the felt pads on the ID of the clamp slide onto nicely - making that diameter do the centering of the clamp, not the LP edge. The platter also has a bit of a 45 degree guide slope or chamfer. My mod was to add 4 blocks to my undersize platter to make it function like more current platters.
Thumbnail for Fig. 2 Close up of mod block and ring. The clamp ring is shown upside down to reveal its details. On my turntable I did have to pay careful attention to where the drive belt rides in height and I ended up having to lower the height of the lid covering the motor pulley to be clear of the clamp ring when in use. Block mount holes were drilled and tapped with platter removed and soft-block clamped to a work table. Mod blocks might also work okay if fixed in place with good double stick tape - not forgetting, of course, to account for tape thickness. In fact this brings up a good point: I made sure to make the blocks a very slight bit thinner than the numbers indicated, and used one layer of double stick tape to make a shim to customize the fit and feel of the ring/platter. There are two locations where one can shim for fit - behind the blocks or behind the felt strips.
Fig. 2 Close up of mod block and ring. The clamp ring is shown upside down to reveal its details. On my turntable I did have to pay careful attention to where the drive belt rides in height and I ended up having to lower the height of the lid covering the motor pulley to be clear of the clamp ring when in use. Block mount holes were drilled and tapped with platter removed and soft-block clamped to a work table. Mod blocks might also work okay if fixed in place with good double stick tape - not forgetting, of course, to account for tape thickness. In fact this brings up a good point: I made sure to make the blocks a very slight bit thinner than the numbers indicated, and used one layer of double stick tape to make a shim to customize the fit and feel of the ring/platter. There are two locations where one can shim for fit - behind the blocks or behind the felt strips.
Thumbnail for (Untitled)
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