Needs Pictures: 0
Picture(s) thanks: 0
Results 1 to 7 of 7
Thread: Sawstop Slo-mo incl dado
-
13th July 2020, 09:05 PM #1GOLD MEMBER
- Join Date
- Nov 2018
- Location
- Newcastle
- Posts
- 1,016
Sawstop Slo-mo incl dado
Jonathan Katz-Moses dose some Sawstop testing - including the dado brake, and ramming the old finger substitute into the blade as fast as he can:
YouTube
-
13th July 2020 09:05 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
13th July 2020, 09:52 PM #2GOLD MEMBER
- Join Date
- Apr 2019
- Location
- NSW
- Age
- 38
- Posts
- 1,134
Only skimmed through it but Not a cheap exercise if he just sacrificed a dado stack and a couple of blades for the video.
-
14th July 2020, 03:28 PM #3
He's not paying for it but he sacrificed 3x dado stacks and 6x regular blades and of course 9x Sawstop cartridges. I was surprised by the shattering of the carbide and welds on the teeth not in contact with the cartridge. Thats a huge amount of force. At 3000 rpm thats 146 km/h to 0 km/h in a fraction of a second.(I think my calcs are close)
Those were the droids I was looking for.
https://autoblastgates.com.au
-
14th July 2020, 04:42 PM #4
I don't think it's the carbide cutter letting go due to the deceleration, but rather the far plate slipping and the cutter smashing into another cutter on the centre plate.
Look at the 6:02 mark.
Annotation 2020-07-14 152740.jpg
-
14th July 2020, 07:11 PM #5
-
14th July 2020, 10:11 PM #6
Yeah you're right, I didn't look at it that closely. It looks like the closest blade was grabbed by the cartridge and the others kept rotating till they also hit the cartridge.
Those were the droids I was looking for.
https://autoblastgates.com.au
-
15th July 2020, 07:28 AM #7
The relative rotations of outer and chipper blades only occurs because of the difference in teeth numbers and the spacing of the teeth on each blade in the dado stack.
The outer blades will most likely stop first as they have the most teeth, so they will always be one of the first blades to make contact with the cartridge. A chipper blade may also make simultaneous contact however with the blade orientations in the stack the chipper teeth are far fewer and offset so there is a much lower probability of that occurring and highly dependent on the chipper blades orientation at the instant of deployment.
Once the outer blades teeth contact the cartridge the huge G forces appear to overcome friction between blades / spacers permitting the other blades in the stack to rotate until their teeth also make contact the cartridge. As he mentions in the clip the G forces are incredible so I would not be surprised if welds or carbides do indeed fail even if they do not clash.
If all blades in the stack were identical, and in alignment, then they should all stop at the same instant that the cartridge deploys.
Due to the design of blades and the recommended method of stacking the internal chipper blades with offsetting to balance the stack and to avoid teeth clashing it is inevitable that the chippers will rotate relative to each other once the cartridge deploys. I'm not sure that I would like to be hit with carbide shrapnel at that speed.
The Saw Stop technology is good, however I have reservations about the integrity of the saw arbor after one or multiple deployments of the cartridge. Does it induce micro cracks in the arbor shaft? Not sure I would ever purchase a S/H Saw Stop machine no matter how convincing the seller was about "the cartridge has never deployed!"
I have this concern as we have a Caravagi garden mulcher powered by a Honda 4 hp horizontal shaft motor coupled to a "flywheel" which houses one 100 mm "planer blade" cutter. The shaft on the original motor sheared off near the seal on the crank case, so at its thickest diameter. It would not have been experiencing the same G forces as the Saw Stop example, though it would have experienced high repetition lower G forces.Mobyturns
In An Instant Your Life CanChange Forever
Similar Threads
-
N.S.W. Table Saw Blades 10" and Dado 8" bits (Sawstop)
By Bernmc in forum WOODWORK - Tools & MachineryReplies: 8Last Post: 19th May 2020, 08:23 AM -
Latest eUpdate Newsletter incl, New Products and Offers
By Gwhat in forum PROFESSIONAL WOODWORKERS SUPPLIESReplies: 0Last Post: 30th August 2018, 10:53 AM -
Another GMC Sale through Dahlsens- Incl Triton
By Trainer in forum TRITON / GMCReplies: 41Last Post: 23rd May 2009, 10:45 AM -
To Dado or not to Dado? Spindle Moulder or Router?
By Dovetail in forum TABLE SAWS & COMBINATIONSReplies: 6Last Post: 13th October 2007, 01:53 AM -
Pen making tutorials incl segmented
By tashammer in forum TUTORIALSReplies: 23Last Post: 4th May 2007, 03:06 AM