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  1. SmithDoor

    Replacing with Brush or Brushless DC motor

    I gave up on videos It to mush hassle so I just use photes for a simpler life. There is software the will reduce the size. I do like seeing videos I had make video about 2 weeks ago for a warranty and change format for emailing. Dave
  2. SmithDoor

    Replacing with Brush or Brushless DC motor

    I wish I had stop at right spot on on large lathes. Maybe it has programing for Four jaw chuck. I like heavy aluminum motor too. Dave
  3. SmithDoor

    Replacing with Brush or Brushless DC motor

    Looks great and lathe does too. Dave
  4. SmithDoor

    Replacing with Brush or Brushless DC motor

    Looks great. Can post photo complete lathe with motor? Dave
  5. SmithDoor

    Replacing with Brush or Brushless DC motor

    That is great I think biggest problem is doing maintenance or lack of maintenance. Your motor should last a long time. 8hrs X 52 weeks is 416 hours a year. You need a new ball bearing in only 48 years. and brush replacement and cleaning every 7 years. Dave
  6. SmithDoor

    Replacing with Brush or Brushless DC motor

    The voltage use UK in home is high 220 volts for kids to ply with. I have never had a thyristors/SCR give out. About only problem was the Varistor giving out. Now I use power strip with Varistor built in if power strip dies just get a new one off shelf and keep going Dave
  7. SmithDoor

    Replacing with Brush or Brushless DC motor

    Just let you the brushless aka 3 phase motor has life span upto 20,000 hours . There are some high end type will go 40,000 hour. The DC motors have about same 20,000 hours and 40,000 hours but brushes need changing ever 3,000 to 10,000 hours and some special can go higher with cost too. The DC...
  8. SmithDoor

    Replacing with Brush or Brushless DC motor

    Looks great Please take video of blue flash and post it here. Maybe live feed just incase. Dave
  9. SmithDoor

    Replacing with Brush or Brushless DC motor

    AC or brushless for 1 hp uses about 1,450 watt A DC pm brush uses 900 watts See charts https://www.mcmaster.com/product/6215K76 There few more calcs on motor by time both AC an DC takes the same amount of power. Watch out for internet data if someone sell they will L○● In my line of work did...
  10. SmithDoor

    Replacing with Brush or Brushless DC motor

    You can easily find thyristors/SCR over 50 AMPS. I do not know how big they go but price price goes up. I first start using the thyristors when they where call SCR in 1960's. The thyristors has great surge/starting amps a 50 amp some have a surge to 1,500 amps. They are great part for motors...
  11. SmithDoor

    Replacing with Brush or Brushless DC motor

    You do lot with adjustment on board. The torque / amps can adjust. From as add more torque the motor slows To as add more torque the speed increase hard stop spindle and will give a lot of torque. On our lathes should adjustment so speed stays the same at any torque. Dave
  12. SmithDoor

    Replacing with Brush or Brushless DC motor

    It looks great. Trying to repair board on business side you not make any money as cheap you boards for today. Most control boards fail because either dust or pood design. Next is owner playing with board. Voltage spikes can be problem in some location but power strip with protection should...
  13. SmithDoor

    Replacing with Brush or Brushless DC motor

    I do not know. I remember reading a long time age on VFD had problems as the frequency is reduced the torque would drop. I have no idea this true or maybe fix problem. The sales people and advertising has errors giving great troubles getting good information. I have be careful about or I...
  14. SmithDoor

    Replacing with Brush or Brushless DC motor

    Here photo of my board if look phoc see MAX the other one see in photo it is low. The torque limit does not on photp Dave
  15. SmithDoor

    Replacing with Brush or Brushless DC motor

    The DC motor have about 6 adjustments . Most mini lathes I seen only has 3 you can adjust 1. Low speed 2. High speed 3 . Max Torque. The rest are per set on board like 4. Torque acceleration 5. Breaking 6. Slope speed increase There some boards 6 adjustments 1. Low speed 2. High...
  16. SmithDoor

    Replacing with Brush or Brushless DC motor

    There lot of place where DC / universal motor are use because of it torque curve. The surprise to me was high end rotor rooter uses a DC / universal motor. But the brush life before replacing is over 7,000 hours. FYI Most graph on brushless is only to sell not for engineering Dave
  17. SmithDoor

    Replacing with Brush or Brushless DC motor

    With brushless/ ac most speed curve (rpm) has same torque. You see that on the graph. The brush motor is very close or could be the graph for motor on the mini lathes. As motor slows down the torque increase a lot from full load speed. If motor says at same voltage and motor slow down the...
  18. SmithDoor

    Replacing with Brush or Brushless DC motor

    One thing I noticed was some the manufacturer lathe using a brushless motor has 4 steps from 300 to 2,500 RPM. The DC brush used only 2 steps 1,000 next step 2,200 or 2,500 RPM. When saw that different it made me wonder on the decision on type. I like a wide range control. Dave
  19. SmithDoor

    Bored off square - How to fix?

    You use 4 jaw chuck or set on mill. The mill is easier than lathe. You can start mill and finish in lathe. If it to far just use DOM tubing as sleeve FYI If it old engine sometime manufacturers would do funny things to fix a error. So trying may not best thing
  20. SmithDoor

    Hello all!

    Welcome to the group Dave
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