correct ER20 and ER16 tool holder for bt-30

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11 Oct 2021 13:27 #222855 by PhilipME
I want to buy BT-30 power head from this link


www.aliexpress.com/item/32819388833.html....44f03c00OezPmD&mp=1

I want to make sure that I buy the matching tool holder and collets for it.

I have no ATC. I will manually replace the tools, It is confusing because there are so many types of tool holders

I think this is the correct one

www.aliexpress.com/item/33018987707.html....44f03c00OezPmD&mp=1

and the collet set there are numbering like ER16-1 and ER16-2  I want ER16 but not sure what is the differance between -1 and -2

www.aliexpress.com/item/32955469867.html....44f03c00OezPmD&mp=1



I will place the order as soon as you kindly direct me if the items in the links match


Philip

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11 Oct 2021 14:14 #222856 by rider-83
The collet holders in the link are the correct ones for that spindle you have chosen.

With the BT30 spindle you are choosing BT30 collet holders for either/or ER16 or ER20 collets.

The ER16 & ER20 collets are just differant sizes, thats all.
ER20 being the larger of the two, and therefor has a greater range.
ER collets can go upto ER32 and then ER40.

The number -1 etc is the size of the bore through the collet which is used to grip the tool.
Example:
You have a cutter with a 06mm shank, and a ER20 holder, then you need:
ER20-6 collet, and so on.

However,what I don't see there are specific details of the draw bar that holds the holders in the spindle. This is important because you will need the correct corresponding 'pullstuds'.
You may need to contact the supplier for this information.
There is a note in the table: M12x45
This could be the type of pullstud required being: M12x45Degree, but make sure that it is. This type is a power type pullstud, not manual.
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11 Oct 2021 15:17 - 11 Oct 2021 16:08 #222858 by PhilipME

The number -1 etc is the size of the bore through the collet which is used to grip the tool.

 
I will not forgive my self for asking this question. It should have been obvious.



Very good now.

I highly appreciate your reminding me about the draw bar. I will contact the manufacturer and see if they can include one. I will make sure that this is a manual tool change.

I have 2  Z-axis stepper motor to chose from, a 23 and 34. I have base plate with holes for both motors. eventhough the calculation shows that nema 23 has sufficient tork, but I suspect that nema 23 can lift 60 ibs( 28 kg). 

I can not thank you enough for answering my questions.

Philip
 

Last edit: 11 Oct 2021 16:08 by PhilipME.

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11 Oct 2021 16:19 #222859 by chris@cnc
Search little more for complete unit. No fast order.
 
Attachments:
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11 Oct 2021 17:13 #222861 by PhilipME
I took the world trophy in fast order and regret.


I came across this one while browsing. It looks interesting.

I was designed my machine with 2 z axis stepper motors controlled by the same signal. One carries the spindle, and the other on the opposite side of the carriage carries the motor with belt in between. 

But such design does not prevent me from using the integrated spindle-motor arrangement.

One thing that I did not feel confident about is the Z ball screw (16 mm) With such weights I should have used 25 mm ball screw.
 
Because most of the spindle assembly weight is carried by the balls(of the ball screw) 

I am still thinking and reading.

Many thanks

Philip



 

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12 Oct 2021 15:53 #222944 by PhilipME
this spindle seems suitable for my application (for a beginner I intend to use max 8 mm bits for mild steel)

www.aliexpress.com/item/32837147837.html....2bb13c00fOi74j&mp=1

It has angular contact bearing
the chuck is integrated to the shaft or fitted in some manner. The issue I am having is that most bt-30 specs do not mention what type of pull-stud or draw-bar. I have no clue if the tool holder is power fit or manually fit.

I do not have provision to fit the tool holder pneumatically and I do not know what is required to do that ( if it is just compressed air or what?)

Just by looking it is not possible to know if it is power fitting or mechanical fitting the tool holder to the spindle.

Philip

 

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13 Oct 2021 23:52 #223050 by andypugh
I think that the integrated spindle has the motor pointing the wrong way.

There are other _far_ more expensive spindles for BT30.

(example: www.ebay.co.uk/itm/154031894469?epid=250...5:g:svsAAOSw3MNfJ8tf )

The difference being that those include the pneumatic drawbar and pull-stud gripper. I really don't think that the one you linked has a pull-stud gripper, I suspect that it has an M12 drawbar.

It is possible to make these things. I have.
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14 Oct 2021 06:34 - 14 Oct 2021 08:51 #223059 by PhilipME
Many thanks Andy

I have very clear picture now.

I can not value enough all the posting here which helped me understand.

I feel more confident now than a couple of days ago.



Thanks all
Last edit: 14 Oct 2021 08:51 by PhilipME.

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14 Oct 2021 11:09 #223071 by andypugh
I think that a BT30 spindle is a better choice than an integrated ER20 as BT allows you to set tool lengths, making tool-changes mid-programme much easier.

With an integrated ER collet you need to re-set the tool length on every tool change.

BT is also better for face mills / fly cutters etc as it has positive drive-dogs.
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14 Oct 2021 11:47 - 14 Oct 2021 11:48 #223075 by PhilipME
Yes

That what I am buying.

The reason I chosed the integrated ER-20 chuck in a previous post was because I was confused between the manual draw-bar and the pull-stud air powered type of spindles. Once that was cleared out of the way, I will buy the one that can take different tool holders.

Many thanks Andy for the advice
Last edit: 14 Oct 2021 11:48 by PhilipME.

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