OK this machine isn't family friendly but boy does it do the job. The safety stop button doesn't work & yes it continues to operate without the lid on.I however have decided to keep it under the condition that "nobody else uses it".It's a grinder for life unlike many others that may only last a few years. Any electrician will be able to open it up & repair no problem. I CANNOT RECOMMEND THIS PRODUCT DUE TO SAFETY CONCERNS. But I love it.