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  1. #1
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    135

    G penny Spindle?

    I've been reading a few posts praising the G Penny spindles. Looking at this one but my inverter is only rated up to 400 Hz (Hitachi X200)

    I'm in the USA so have access to 220 AC single phase.

    I like the look of this one wit the ceramic bearings but it's a 800Hz unit. Anybody know of something similar that will work with my inverter?

    https://www.aliexpress.com/item/3303...67891e53ISJtHB

    I guess I could just bite the bullet and get the spindle/inverter kit?

    Thanks in advance.
    Is a sentance fragment?

  2. #2
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    Jan 2005
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    12186

    Re: G penny Spindle?

    Quote Originally Posted by Tristar500 View Post
    I've been reading a few posts praising the G Penny spindles. Looking at this one but my inverter is only rated up to 400 Hz (Hitachi X200)

    I'm in the USA so have access to 220 AC single phase.

    I like the look of this one wit the ceramic bearings but it's a 800Hz unit. Anybody know of something similar that will work with my inverter?

    https://www.aliexpress.com/item/3303...67891e53ISJtHB

    I guess I could just bite the bullet and get the spindle/inverter kit?

    Thanks in advance.
    Yes you can get the same spindle in 400Hz the 800Hz is a 4 pole and the 400Hz is a 2 pole a 4 pole will have more torque, the G-Penny 2.2Kw 2 Pole is 10A with a speed range of 3000 to 24000 so one of the better spindles and has more torque than any other spindle in it's size
    Mactec54

  3. #3
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    Re: G penny Spindle?

    Quote Originally Posted by mactec54 View Post
    Yes you can get the same spindle in 400Hz the 800Hz is a 4 pole and the 400Hz is a 2 pole a 4 pole will have more torque, the G-Penny 2.2Kw 2 Pole is 10A with a speed range of 3000 to 24000 so one of the better spindles and has more torque than any other spindle in it's size
    I use my homebuilt mill for many things but the most demand I put on it would be cutting 6061 aluminum. I make parts for the next CNC project and some bike parts etc. I mostly use end mills from 1/8 to 1/4 although I have collets and cutters larger and smaller.

    Would you recommend the 2 pole motor for this kind of work or should I be looking at the 4 pole, 800 Hz and buy the VFD as well?

    I'd rather put my money in a new spindle and use the VFD I have if it will work out well for me.

    Thanks for taking the time to answer my questions Mactec54.

    I'll poke around and see if I can find the 2 pole version you mentioned.
    Is a sentance fragment?

  4. #4
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    Re: G penny Spindle?

    I'm having a hard time negotiating the "Chinelish" on the Ali Express site. If anybody can point me to the correct product I'd be most grateful. Not sure If I should be looking at the water cooled version or air? I have a water cooled laser cutter so I could tap into it's cooling system if need be.
    Is a sentance fragment?

  5. #5
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    Re: G penny Spindle?

    Quote Originally Posted by Tristar500 View Post
    I'm having a hard time negotiating the "Chinelish" on the Ali Express site. If anybody can point me to the correct product I'd be most grateful. Not sure If I should be looking at the water cooled version or air? I have a water cooled laser cutter so I could tap into it's cooling system if need be.
    What RPM are you using now for your aluminum cut this will give an indication which spindle will be best

    Water cooled spindle is best

    Here is the 400Hz with the option of Ceramic Bearings but before you buy we need to know what cutting speeds ( RPM ) you run at

    https://www.aliexpress.com/item/3280...38211716mpu9Mg
    Mactec54

  6. #6
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    Re: G penny Spindle?

    I've never had any formal training as a machinist and have learned by trial and error over the years.
    The spindle on the machine currently is a TAC Japanese unit I picked up off of Ebay 20 years ago. It's 3 phase 60 Hz spinning at 3600 rpm. I have it fitted with an ER-20 Collet chuck.

    I don't know if a higher RPM would allow for faster cutting or not. As I said, It's all trial and error for me.
    Is a sentance fragment?

  7. #7
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    Re: G penny Spindle?

    Quote Originally Posted by Tristar500 View Post
    I've never had any formal training as a machinist and have learned by trial and error over the years.
    The spindle on the machine currently is a TAC Japanese unit I picked up off of Ebay 20 years ago. It's 3 phase 60 Hz spinning at 3600 rpm. I have it fitted with an ER-20 Collet chuck.

    I don't know if a higher RPM would allow for faster cutting or not. As I said, It's all trial and error for me.
    You won't be able to cut aluminum at those speeds with either of the 24,000 RPM spindles with the 2 spindles the 4 pole would be the best, but you would need a VFD Drive as well the 2 Pole will cut aluminum at around 4,500 to 7,200 RPM but light cuts at the 4,500 RPM

    Yes your feed rates will be higher
    Mactec54

  8. #8

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    Apr 2020
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    7

    Re: G penny Spindle?

    I have owned a G Penny 800w water-cooled spindle coming up to 2 years and I have not had any problems with it.
    When I purchased it I had problem with the VFD display but the speed controller worked fine.
    I contacted the seller, they where very helpful, another display was sent out with a remote cable about 1.5m long.

    Positive feedback from me.
    I had a great experience with them pre sales and the experience continued with their after sales support.

  9. #9

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    Apr 2020
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    Re: G penny Spindle?

    Quote Originally Posted by mactec54 View Post
    You won't be able to cut aluminum at those speeds with either of the 24,000 RPM spindles with the 2 spindles the 4 pole would be the best, but you would need a VFD Drive as well the 2 Pole will cut aluminum at around 4,500 to 7,200 RPM but light cuts at the 4,500 RPM

    Yes your feed rates will be higher
    I would have to disagree with this statement, the quoted speeds are traditionally tested and recommended however the speeds are also dependent on the type and diameter of cutter.
    Aluminium is being cut with high feeds and speeds exceeding 40,000rpm, I am personally looking at upgrading to the 400w 60,000 RPM water-cooled ceramic bearing spindle for that exact reason.
    Trade torque for velocity.

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