Machine Shop requires the parent or guardian to take the class concurrently or before the minor (16-17 y/o) before the minor is allowed to use the Sherlines. This is to ensure the parent knows what risks the minor is being exposed to. No saying “I didn’t know it was that dangerous.” This helps protect DMS and allows the minor to use machine on heir own.
They can use other machines with direct adult supervision, from Machine Shop wiki:
Minimum Age To Use Tools:
You MUST be a minimum of age of 18 to use any powered tools unsupervised in the Machine Shop.
If between age of 16 and 18 years old and a member (add-on) that has been trained on that machine, they may use it under the close, immediate, and active supervision of the Parent or Guardian that has also received training and qualified to use that machine. “Close, immediate, and active supervision” means the parent/guardian is physically standing next to the minor, observing and supervising so as to be capable of taking immediate action in the event of injury or machine malfunction. Texting, talking on a phone or use of another electronic device while the machine is operating constitutes failure to actively supervise. If you need to use the device, stop the machine and resume when you can resume full attention.
Exception: 16 and 17 year old add-on members. You may take the Bench Top Sherline Mill and Lathe classes concurrently with a parent or guardian or if the parent or guardian has completed the class. This is an exception to the Machine Shop Rule that powered machines may only be used by members 18 or older. 16 or 17 year old that completes these requirements may use the machine unattended by a parent or guardian.