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Type: Posts; User: Bdrangdo

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  1. Replies
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    Re: Cleaning Linear Glass Scales

    I have used brake cleaner in the past simply because it was all I had and because of the straw on the aerosol can it is easy to get inside and then a quick blow off with compressed air.
  2. Re: New Servo Drives for Old Home built machine

    Brushed DC motors will be even larger than the DMM motors for the same torque, even more so if they have tacho's fitted which you will need if you are using velocity control. Dave
  3. Thread: fagor 8055 tc

    by Bdrangdo
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    1,562

    Re: fagor 8055 tc

    The 8055 eprom model uses a different rs232 connection to the later 8055i. Pin 2 goes to pin 2 and pin 3 goes to pin 3. They are usually reversed. The 8055i has extra parameters but is otherwise...
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    Re: Vfd 415 motor 240v supply.

    It does look like it is delta connected for 415v, it is probably designed to be used with a star delta starter. You can get inverters that will step up to 415v from 240v but they are pricey for a...
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    Re: Vfd 415 motor 240v supply.

    Also a pic of the internal connections in the terminal box.
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    Re: HITACHI SEIKI 4NE NOT READY

    There should be a pressure or a flow switch in the hydraulics which gives confirmation of the pump working, the control is maybe waiting for that signal, check the switch which be closed (probably)...
  7. Re: BMC30 no response when start button is pushed in

    The 24v supply may not be adequate to drive the relays which enable the drives amongst other things, modern power supply's only produce a limited amount of power because it is only used to power the...
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    Re: Vfd 415 motor 240v supply.

    Are you sure it is delta, small three phase motors that use a 415v supply are usually wired star which would allow you to connect as delta for 240v three phase. Dave
  9. Thread: What is in it

    by Bdrangdo
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    429

    Re: What is in it

    I can understand your drawing and how it clamps the work piece, but it is not clear to me how it clamps the work piece to the bed because it is essentially floating in principle. I guess they would...
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    Re: ac servo motor noises, pops, knocks, :)

    I need to get my eyes tested, or learn to read, I missed the reference to an AC motor.
    I
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    Re: ac servo motor noises, pops, knocks, :)

    The "dead band" I am referring to is a general term we use in the UK that is a parameter setting in the axis control parameters, maybe you uses a different term in the US. It determines the number...
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    Re: ac servo motor noises, pops, knocks, :)

    I don't know what control you are using, each one is different, the "dead band" is an imaginary position that the control considers to the correct position and the servo becomes unpowered. If the...
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    Re: ac servo motor noises, pops, knocks, :)

    Try increasing the dead band and see if that helps.

    Sometimes ballscrew or thrust bearing backlash can inducing hunting/oscillation, even more so if the positional feedback is from linear...
  14. Re: Will a vfd control the speed of a single phase 240v AC brushed motor?

    If the speed is 1420rpm then it is almost certainly an induction motor assuming it is 50Hz supply. Brushed motors will usually run much faster than that. In principle you can use a VFD with a single...
  15. Re: Will a vfd control the speed of a single phase 240v AC brushed motor?

    If the motor is brushed (universal motor) then the answer is definitely no, frequency has little direct effect on this type of motor, they will run just as well on DC. Most speed controllers for this...
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    Re: Servo motor overheating

    I am not sure about this, ceramic bearings effectively electrically insulate the rotor from the fluctuating magnetic fields and could possibly cause the rotor and the exposed shaft/coupling to...
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    Re: Servo motor overheating

    C3 bearings have a little extra clearance to allow for heat expansion so they should be just fine for a servo can get rather warm under normal circumstances. Dave
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    Re: Servo motor overheating

    If the bearings were so heavily loaded as to produce significant heat they could well be damaged now or the grease has become carbonised. That type of bearing is not designed to be heavily loaded...
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    Re: Servo motor overheating

    The washer that is normally fitted is a kind of wrinkled preload washer that exerts a minimum of force and should make little difference to the pressure needed to turn the shaft. There should be a...
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    Re: Servo motor overheating

    Is the motor free to turn by hand ?, there should be no resistance at all, sounds like the bearing closest to the pulley is binding or misaligned . The winding's are just underneath the case so if...
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    Re: Motor encoder alignment

    Thanks for that Al, I will have a look round and see what is available in the UK. Dave
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    Re: Motor encoder alignment

    Hi, is it possible to buy third party encoders with hall sensors or simulated hall sensors, I have never seen them advertised. The reason I ask is because I have a motley collection of AC servo...
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    Re: Could I machine ballscrews?

    You can easily machine ball screws if you soften the ends by heating the end to red heat and allow them to cool slowly. usually they are only case hardened to a depth of around 1.5 - 2mm so you can...
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    Re: Fagor 8035 Backup

    Before you do anything else change the battery. Most likely the parameters will be lost.
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    Re: New Maintenance Tech Nightmare

    Fagor automation has all the documentation free to down load. There is a large section dedicated to writing the PLC program which it must have even if it is only very basic. The manual does give an...
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