Vintage DD turntables. Are we living dangerously?

If you are soliciting opinions from anyone with an opinion, then here is mine. It is a great idea to have a massive arm pod, and Henry has done a fine job design ing and constructing his. I could never do as well. However, the arm pod should be firmly physically attached to the same structure that supports the turntable bearing, so that the two are as close to being one as is possible. The arm pod should not stand alone.

Take a look at the arm mount and the underside of a Kenwood L07D, if you want to get an idea of how this can be done.

Thanks Lewm. What is the disadvantage of stand alone armpods and why is it crucial that there is a connection between armpod and table? Does the physical connection bear any advantages?

Taking Henry's excellent implementation, would it help if the separate armpods are standing on a firm platform as well as the 101 or would you propose a touch to touch connection between armpods and table?

I have seen the Kenwood's realisation. Very well done!
Just imagine one would take a non-plinth integrated 101 how could you connect pods with the table?

Thuchan
What is the disadvantage of stand alone armpods and why is it crucial that there is a connection between armpod and table?

This subject was a bone of contention here previously with the Train
analogy front and center. I will leave it at that.

If the table has a suspension it's necessary to have the arm move with the platter.

If there is no suspension the advantage of a subchassis (structure that connects arm pod to the main bearing) is convenience. The disadvantage is, vibrations are usually more easily transmitted from platter, and possibly motor, to the arm.

Maintaining a fixed relationship between arm pod and platter makes it easier to keep mounting distance accurate, especially when swapping arms. Armboards can be cut based on that fixed relationship.

Thucan -
it is very simple.The stylus is measuring the groove. To accurately measure the groove the platter and arm board must maintain a constant relationship. They must be rigidly coupled via a close loop system to ensure there is no differential movement between the two. Imagine trying to measure the length of a piece of wood with the 0 point of the tape moving back and forth.

A similar case can be argued for having a rigid closed loop between the motor and platter. Physics tells us that where a platter/arm are not rigidly coupled to the motor drive, then there will be speed instability. Examples are
1) Where people put TT's on air platforms and the motor is on another table
2) The motor is mounted on a chassis and the platter/arm are mounted on a suspended suspended sub chassis.