[SCzEngrgGroup]

Let's suppose for a moment you are right.

Then why don't we see low power BT spindles without drive dogs? If they are not mandatory from an engineering perspective then costwise there would be no reason to manufacture and install them. And yet even the cheap china spindles have them. So, I wonder...

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Because they are built to handle the maximum torque BT is capable of. But if you don't NEED that much torque, you don't NEED the dogs. The incremental cost of adding the dogs is pennies.

Regards,
Ray L