Need to adjust the speed every time I turn on turntable

This is a common problem with BD tables. It is caused by a combination of belt slippage (which can be cured with proper tension) and belt creep which cannot be cured, but can be compensated for with feedback. No matter how accurate the motor speed, without feedback the platter speed will vary over time due to a number of variables that cannot be controlled.

SOTA now sells a PSU and tach with feedback that will keep the platter on speed regardless of variables such as belt diameter and durometer, stylus drag, bearing oil viscosity, temperature, belt creep etc.
https://sotaturntables.com/product-category/eclipse-series/

There is of course the well-proven quartz oscillator based PLL method used in better direct drive turntables. 

one thing to consider is your power going to your house changes a few volts all the time that alone will throw off a turntable with out compensation.  

My place fluctuates up to 10volts depending on the time of day and temperatures. 

glennewdick

one thing to consider is your power going to your house changes a few volts all the time that alone will throw off a turntable with out compensation.

No, it won't. Turntables don't rely on AC voltage for speed regulation. The ones that use AC motors are synchronous to the line frequency, which is subject to only very tiny deviation by the very nature of AC distribution systems. Those that use DC motors employ regulation in the DC power supply.

I run mine through a PS Audio Power generator.  (P1000) Same Voltage. frequency every time. 
Also every time I put a tiny screwdriver in the adjustment screw the speed goes crazy.  I adjust and it goes back to normal again, and I can determine if it is improved.  Ground issue???