Roto Zip Bit Experiment - Failure

Roto Zip Bit Experiment - Failure

Postby Mark's Wood Chips » Sat Apr 29, 2017 5:10 pm

In my quest to find an inexpensive down cut spiral bit in my CNC, I tried a 0.125" Roto Zip bit. Things looked promising for about 3 minutes then the bit broke running at 18K @ 60 ipm. OK, so I need to fiddle with speeds and feeds right? Not! Upon inspection, I discovered that the bit flexes a tremendous amount. The photos show a thru hole centered in a hex pocket except for the fact that the hole isn't round (yes, it was drawn as a circle). The profile cutout shot clearly shows significant flex during ramped plunges. Lesson learned and added to my wall of shame. :oops:
Attachments
IMG_0126.JPG
Roto Zip Bit
IMG_0124.JPG
Ramped Plunge Flex
IMG_0125.JPG
Not Even Close to Being Round
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Re: Roto Zip Bit Experiment - Failure

Postby highpockets » Sat Apr 29, 2017 5:52 pm

Nice experiment Mark.
I have trouble not breaking Roto Zip bits by hand. If you look at how they are cut there isn't much center stock.
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Re: Roto Zip Bit Experiment - Failure

Postby TReischl » Sat Apr 29, 2017 6:18 pm

Mr Mark, if you are looking for CHEAP .125 bits try eBay. I bought two ten packs, one pack is flat bottomed cutters, the other is ball nose.

You will need a .125 collet if you do not already have one. I tried one of those adapter collets. That did not work real well, seems it did not hold onto the bits very well at all.

The cost was less than $10 for ten of them.

Here is a link:

http://www.ebay.com/itm/10X-1-8-Carbide-Flat-Nose-End-Mill-CNC-Router-Bits-Double-Flute-Spiral-17mm-/400934496161?hash=item5d598ee7a1:g:1OYAAOSwv0tVdU4z

What has surprised me is that I am still on my first one! I have cut quite a bit with it. At a buck a piece it is hard to beat.
http://www.tedreischl.com

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Re: Roto Zip Bit Experiment - Failure

Postby ger21 » Sat Apr 29, 2017 6:44 pm

Gerry
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Re: Roto Zip Bit Experiment - Failure

Postby highpockets » Sat Apr 29, 2017 6:44 pm

I've had really good luck with the cheap ebay bits, they seem to last pretty good. Maybe I'm just not that picky.
The problem is I've yet to find a down spiral cheap bit. I think that is what Mark was going for.
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Re: Roto Zip Bit Experiment - Failure

Postby highpockets » Sat Apr 29, 2017 6:46 pm

As I typed.... Thanks Gerry. :D :D
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Re: Roto Zip Bit Experiment - Failure

Postby Mark's Wood Chips » Sat Apr 29, 2017 8:49 pm

I use 0.125" spiral end mills and ball nose bits purchased from Ebay vendors and I'm pleased with the cut and longevity. Might have to wait a few weeks for delivery but you can't beat the price. I use ER-16 collets and they work well in my Porter Cable router - adapter and collets purchased from Precise Bits.

Highpockets was right, I'm looking for down spiral bits without breaking the bank.

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Re: Roto Zip Bit Experiment - Failure

Postby scottp55 » Sat Apr 29, 2017 10:17 pm

+1 Ger,
I use Drillman1's .125 and .0625" Downcuts all the time in a variety of hardwoods with excellent results, and usually get the bits within days.
Ordered several times, and always fast shipping and consistent high quality and dimensions.
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Re: Roto Zip Bit Experiment - Failure

Postby ElevationCreations » Sat Apr 29, 2017 11:37 pm

+1 for Drillman1 on eBay.
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Re: Roto Zip Bit Experiment - Failure

Postby armbrusterco » Sun Apr 30, 2017 2:28 am

+2 for Drillman.
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