PreciseBits DeWalt DNP-611 1/8" collets are in stock

Brian Stone
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by Brian Stone » Sun May 03, 2015 6:03 am

TomDChi wrote: Do the PB collets work well with for instance a 6mm mill in a 1/4 inch (6.35mm) collet?

I notice that PB doesn't offer metric collets (at least for the models I've looked at), compared with Elaire. Is this an indication that the close metric size mills work well with the next size larger US unit model?
I haven't tried it, and I wouldn't trust it, to be honest. I pulled that information from a post on a different forum, so... red flag #1. I haven't been able to corroborate or confirm it (red flag #2), and I'm not going to experiment with $20+ bits and collets to find out if it actually works. Common sense says that a 6mm shank requires a 6mm collet, so that's what I would do.
Shapeoko 2 #7353
1500x1000mm Shapeoko/X-Carve Hybrid, Nema-23's, Belt-Driven Z-Axis /w ACME Screw, Dewalt 611, Soundproof Enclosure
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WillAdams
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by WillAdams » Sun May 03, 2015 11:24 am

It’s my understanding that the ER-style collets in the Precise Bits collet system are usable w/ a wider range of sizes, so the near metric sizes fit/work — you could confirm that by contacting the company.

If I did that, I’d buy dupes, label them, and once a collet was used for Metric, would not use it for Imperial.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets

Brian Stone
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by Brian Stone » Mon May 04, 2015 7:01 am

I measured the inner diameter contraction of the exposed rim of the PreciseBits DeWalt 611 1/4" (6.35mm) collet to the best of my ability:

6.40mm (+-0.1mm) at 0% contraction
5.84mm (+-0.05mm) at 100% contraction

I defined 100% contraction at the point when the collet nut begins to resist turning with "light finger strength"... not particularly scientific, but oh well. This doesn't mean that it's absolutely safe to use a 6mm shank in the 6.35mm collet, but it might work. Again, these measurements are of the exposed rim of the collet. I can't measure the magnitude of deflection of the fingers deeper in the collet, which I think you really would need to know to be sure that the bit will be held firmly enough.
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TDA
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by TDA » Mon May 04, 2015 3:17 pm

The clamping range on our 611 collets are about the same as the ER11 collets (0.0200"). So there shouldn't be an issue using a 6mm tool in a 1/4" collet.

If there's anything I can help with please let me know.
John Torrez
Think & Tinker / PreciseBits

WillAdams
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by WillAdams » Mon May 04, 2015 3:29 pm

Thanks!

I tweaked the upgrades overview page a bit to say:

==Rotary [[Spindle Options]]==
*[[Spindle Control]]
*[[Spindle Mount]]
** [[DW660]]
** [[DWP611]]

Note that spindles may be upgraded w/ better collets. Some are merely replacements for the standard collets in different sizes, while at least one manufacturer offers specialized adapters which allow one to use industry standard (ER) collets. These are more convenient and easier to change (esp. if one buys a matching nut for each collet) and afford a greater clamping tolerance (e.g., a 1/4" collet can hold a 6mm endmill[http://www.shapeoko.com/forum/viewtopic ... 553#p46553]).

I guess we should probably make a page specifically for [[Spindle Collets]] since the [[Spindle Options]] page is getting so unwieldy.
Shapeoko 3XL #0006 w/ Carbide Compact Router w/0.125″ and ¼″ Carbide 3D precision collets

Brian Stone
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by Brian Stone » Mon May 04, 2015 4:23 pm

Thanks for the confirmation, John!
Shapeoko 2 #7353
1500x1000mm Shapeoko/X-Carve Hybrid, Nema-23's, Belt-Driven Z-Axis /w ACME Screw, Dewalt 611, Soundproof Enclosure
[Fusion 360 | Illustrator] -> Universal G-Code Sender

TDA
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by TDA » Mon May 04, 2015 6:40 pm

Will, you might want to tweak that again. Our system doesn't adapt the routers to use standard ER collets. Rather, we base the collet on ER design matching the angle of the router bore. There are obviously other differences from standard replacement collets (e.g. TIR, balancing, clamping force, a nut/wrench system to remove radial distortion). But I don't want to start sounding like a marketing guy so I digress. Simple way to sum it up would be "ER style collets".

An adapter is typically something that is putting more components between the bore and the tooling. In general anything that is put between the bore of the router/spindle and the tool can add runout. As an example let's take a collet reducer. For the sake of example let's assume that each part has 0.001" of runout:

Bore/collet (0.002" total runout)
Bore: 0.001"
Collet: 0.001"

Bore/collet/reducer (0.003" total runout)
Bore: 0.001"
Collet: 0.001"
Reducer: 0.001"

The same would be true for a system that changes the accepted taper:

Bore/taper adapter/collet (0.003" total runout)
Bore: 0.001"
Adapter: 0.001"
Collet: 0.001"

Bore/collet/taper adapter/collet (0.004" total runout).
Bore: 0.001"
Collet: 0.001"
Adapter: 0.001"
Collet: 0.001"

Obviously this can be reduced by using low runout parts (or made worse by high runout parts). However, the price starts to climb significantly the more parts you are trying to control.

Sorry Will. Not trying to make work for you. I appreciate all the time you put into the wiki (I would hope everyone here does). Just trying to be accurate and provide supporting info.

If I can be of any help please let me know.
John Torrez
Think & Tinker / PreciseBits

TomDChi
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Re: PreciseBits DeWalt DNP-611 1/8" collets are in stock

Post by TomDChi » Tue May 05, 2015 8:02 pm

I had sent and e-mail to Precise Bits asking about this issue and linking to this thread - I think John's ("TDA") comments are a reply to my questions.

From John's comments, it sounds like there may not be a need or benefit to setting a collet aside once it has been used for a different size bit (such as putting a 6mm bit in a 1/4"/6.35mm collet). It makes sense that in some cases, pushing a piece of equipment beyond it's original design changes it to the point that you can't expect it to perform like new - but I have no point of reference for this case.

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