If it is actually metal, a close inspection of the knife, plate, auger and housing should give clues on where it is coming from. Look at the friction points where surfaces make contact for signs of metal loss and wear. Don’t forget to check that back end of the auger where it enters the motor drive. There should be a plastic or brass bushing or washer there.
As mdseaside mentioned, you should be oiling the plate and knife with food grade oil. This is so when you start the grind they have some lubrication till the meat makes it through the auger and can act as a lubricant for the knife and auger.
Double dose of sodium phosphate
Question…. I had a batch of wild game bacon (used Imitation Bacon (no MSG) from Walton’s) that got an accidental dose of cold phosphate @ 2 oz / 25 lbs. It’s my understanding that the imitation bacon seasoning already came pre-mixed with sodium phosphate, so in essence this batch got a double dose. I sampled a small slice and it tastes fine (it’s actually fantastic), but is it safe to plan on eating the rest of it??
dustyjasken191 Where I am not a Doctor, I’m not seeing where it will cause any immediate health effects. Consuming too much sodium phosphate over extended periods of time can cause long term health problems though, according to the Google.
dustyjasken191 The only possible downside of this that if you use way too much sodium phosphate you can develop a soapy taste in your product. I don’t think the rates you are talking about will cause any issues with either taste or health.