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Thread: Chinese Spindle
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11th December 2009, 06:59 PM #1Novice
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Chinese Spindle
I have recently purchased a Chinese spindle 4kw ($600)US, the reason I went for this spindle was because of the ER20 Collet. The photo on Ebay was of a cylindrical Spindle however the one I received was rectangular shaped. The supplier has informed me that they no longer make the cylindrical type in that size any more. I don’t mind because it should be easier to attach as there are tapped holes on the back.
I was surprised by the weight of the spindle (8kg), so I would appreciate some help on mounting this heavy thing.
My machine is a Joes4X4 using a Milwaukee Die Grinder, I am worried about the weight of this new spindle; in particular will the current setup support it.
The Zaxis is run on 4 vbearings a ½” ACME rod and Dumpster anti backlash nuts. The Yaxis is the same.
Should I beef any of this up For the new spindle?
Any help would be appreciated.
Mike
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11th December 2009, 09:39 PM #2GOLD MEMBER
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That's a whopper of a spindle.
It is difficult to assess with a couple of photos and the best advise I can give you is mount it and try it out. Retune all your motors as the weight might make a difference there.
5 HP is a lot to be running so are you running out of single or three phase outlet?Cheers,
Rod
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12th December 2009, 10:53 AM #3Novice
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Chinese Spindle
Rod
I will be running it single Phase.
The reason why I picked this particular spindle was that it was the only one with an ER20 collet (from this supplier love happy). I was astounded by the weight.
Attached is a pic of the antibacklash nut I am using, it is mounted through 1 side of a piece of 30 X 30 mm by 3mm aluminum angle. the other side of the angle is bolted to the Z slide. A lot of weight for a short bit of aluminum.
Cheers Mike
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12th December 2009, 11:17 AM #4SENIOR MEMBER
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As far as I know, the largest VFD that will run on 240 v single phase, is 2.2kw.
Greg
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12th December 2009, 11:20 AM #5GOLD MEMBER
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Hi Mike
Even the 1.5kw spindles are heavy - certainly a lot heavier than a die grinder. You should see a big difference in noise and performance over the die grinder.
I can't see the amps for the 4kw on his site but a 3kw uses 12 amps so you might need 15 amps or more for the 4kw.
If you are looking for collets then try this site . This is the same ebay seller we have used but cheaper on this site and freight is very reasonable. He has both imperial and metric collet sets for the ER20.
Yes the aluminum angle might be a bit light for the spindle but no harm in trying it first. If it fails I would be looking for a block of ally and machining out a hole for the nut - use your current setup to machine it.
The Dumpster nuts are well designed and get good feedback.Last edited by rodm; 12th December 2009 at 11:22 AM. Reason: Sorry about the double up on the amperage - Greg types quicker than me. :-)
Cheers,
Rod
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12th December 2009, 12:49 PM #6Novice
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Chinese Spindle
Rod,
I will take your advice and beef up the aluminum. Yhanks for the info on the ER20.
Greg
I assume from the write up and the attached wiring diagram that it is single phase.
Mike
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13th December 2009, 01:21 AM #7SENIOR MEMBER
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With a massive amount of draw I recon you would need at least a 20A plug.
I haven't even seen any 20A plugs or leads so if it is indeed 240V @ 4000W I recon it will need to be wired to the mains.
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13th December 2009, 12:05 PM #8Novice
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Chinese Spindle
You blokes are getting me a bit scared now.
I dont know wether I should fire it up or not. I noticed on the other sellers site that he has 2.2kw with ER20 Collett, maybe I should cut my losses and go for one of those.
Mike
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13th December 2009, 01:28 PM #9SENIOR MEMBER
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Mike
You have said that you have a 4kw spindle. I have to assume you also have a 4kw VFD.
What do the specs on the VFD say? It should clearly spell out the input requirements.
Greg
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13th December 2009, 02:59 PM #10Novice
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Chinese Spindle
Greg
As you can probably tell I am a bit out of my depth here.
There is a small sticker on the front of the VFD that reads, 220V 4.0KW.
Below is how it was advertised
Technical Parameters
1) Spec: 105*280 mm (Diameter:105mm x Length:280mm)2) Power: 4 KW
3) Voltage: 220V~250V
4) Frequency: 400 Hz
5) Speed: 8000-24000 R/min
6) Air Cooling
7) ER20 collet chuck
8) Runout off: less than 0.005mm
9) Grease Lubrication
Tthe supplied VFD Manual gives a table that suggests, as you previously posted, that the max 240V VFD is 2.2KW. I dont know how to show the table here. It is online at http://www.jinlantrade.com/Stock files/VFDManual.doc .
Mike
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13th December 2009, 06:32 PM #11SENIOR MEMBER
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The specs that you posted are for the spindle not the VFD
On page three of that doc it shows an example of the VFD name plate. It has the input.
On page eight, in the model list, the ones close to 4kw, are 3.7 and 5.5kw models.
Presumably you have one of these two. Both of them have input specs of three phase, 380v.
Greg
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13th December 2009, 07:09 PM #12Novice
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Chinese Spindel
Greg
The VFD Has One and only one sticker as shown in attachments. It reads 220v 4.0KW.
Also an attachment of a thomas table that I have just finished for one of my grandsons 6 coats of clear acrylic.
Mike
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13th December 2009, 07:20 PM #13
I could be wrong here, but the 4Kw on the VFD would be what it is capable of handling, ie you can hook a 4Kw motor up to it. If you hook up a motor of a lower rating it will only draw the amps that that motor draws, ie if you have a 1.5Kw motor (2hp) than that is what it would draw.
What does it say on the spindle, how many amps or Kw is it rated at? That is the important figure, not what the VFD can handle.
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13th December 2009, 09:30 PM #14
Hmm, looked these spindles up on Ebay, the love-happy ones, and it does indeed appear that you have a spindle that is rated at 4Kw. There is no way that's going to run from a 10A power point, and I would say a 15A dedicated circuit would be doubtful as well.
You say you selected the 4Kw spindle because it has an ER20 collet chuck, he does however also sell a 2.2Kw spindle with an ER20 collet chuck and I would suggest that is the one you need.
http://cgi.ebay.com.au/2-2KW-WATER-C...item5ad4ec1306
It probably won't wiegh as much as the 4Kw spindle either. Your existing VFD would run that, so all you would need is the new 2.2Kw spindle, not the spindle/VFD package.
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13th December 2009, 10:37 PM #15SENIOR MEMBER
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Fred
You are presuming the 4kw VFD that Mike has, can be run from 240v.
That may, or may not, be the case.
Greg
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