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Quad Roller Skating Forum Discussions about quad roller skates and any other quad skating discussions that do not seem appropriate for one of our other forums.

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Old March 17th, 2016, 02:56 PM   #221
amohrfeld
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Quote:
Originally Posted by Armadillo View Post
Good quality 7mm steel axles will more normally be made from a material closer to specs of alloy socket head cap screws, which are typically 170KSI tensile strength
McMaster → http://www.mcmaster.com/#socket-head...crews/=11kqqfs

The best Grade 5+ alloys of titanium fasteners come in at ~150KSI tensile

-Armadillo

-
Ahh. That makes more sense. If I remember correctly; most ASTM A574 (socket head cap screw material) is made from heat treated 4142 steel. So It could be considered chrome molly. And now that I think about it you would want the steel harder than a standard quenched and tempered 4130 or 4140 - To prevent bending.
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Old March 17th, 2016, 04:50 PM   #222
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Default What are we trying to PROVE!

The whole idea of using Titanium hardware is weight reduction. It will never be a s strong as the 4340 heat treated axles, but it weighs far less. When you start to add up 4 King Pins, 4 axles (flips no nuts), TI pivot pins you start to shed incredible numbers when your ultimate goal is to get the weight as low as possible.

There has always been complaints of Grade 2 Titanium bending. it is not even as close, not in the same ball park as 6al4van. This is a fact look at the tensile Strength numbers, or the Modulus Elasticity numbers for the two, (Areospace Specification Metals, web site) it breaks it down very well.

What I know for sure, I have had countless Axle's, Pivot Pins, and Kingpins made from 6al4van shipped around the world now since I started machining for anyone that wants them, and have not had to remake a one. All different weight's of skaters, different types of skating, Speed, Jam, Derby, no complaints (Knock on Wood).

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Old March 24th, 2016, 08:18 AM   #223
PortlandAussie
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Default New Boen RK Speed UL

2 Mysteries:

1. I actually ordered the RK Speed SL (the ones which aren't trenched through: http://www.boen.it/scheda.asp?idprod=448&idpadrerif=110), and realized they sell the Ti kingpins separately and the SL doesn't come with them. So I sent Boen a note and said "Can you just swap the steel kingpins for the Ti ones in the SL i ordered, and charge me the difference?" - he said sure. I figured i would get an SL with Ti king pins, but what turned up is the trenched through version, in the size i ordered (size 17/180mm). It must be the RK Speed UL (lighter version), but that size isn't available on their website.

2. The page for the RK Speed UL (and i guess the other speed plates?) does themselves a bit of a disservice: http://www.boen.it/scheda.asp?idprod=446&idpadrerif=110. They list "Frame weight 380 g. (16 size)" yet the frames i got (as you can see) are about 360g, and size 17 (180mm) - a full 12mm longer than the 16 (168mm).

So after all that rambling, here are the photos:

New Boen/Boiani RK Speed UL size 17 - 180mm/7.08 inch wheel base - 361g



Last edited by PortlandAussie; March 25th, 2016 at 01:46 AM.
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Old October 29th, 2016, 09:57 PM   #224
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143mm SG Nova plate after NTS conversion = 112g
13g weight savings



152mm Pilot Falcon plus after NTS conversion = 393g
30g weight savings (could have been 35+ if I was more aggressive)



BONUS:

Bont Royal Assassin 95A 7mm bearings = 90g



Bont Royal Assassin 92A 8mm bearings = 89g
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Old October 29th, 2016, 11:29 PM   #225
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Quote:
Originally Posted by Trixton View Post

143mm SG Nova plate after NTS conversion = 112g
13g weight savings


152mm Pilot Falcon plus after NTS conversion = 393g
30g weight savings (could have been 35+ if I was more aggressive)

BONUS:

Bont Royal Assassin 95A 7mm bearings = 90g


Bont Royal Assassin 92A 8mm bearings = 89g
You really need to give a WARNING!!! → Weights shown are TARE ADJUSTED to HIDE THE WEIGHT OF THE BEARINGS!

-Armadillo
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Old October 30th, 2016, 02:19 AM   #226
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You really need to give a WARNING!!! → Weights shown are TARE ADJUSTED to HIDE THE WEIGHT OF THE BEARINGS!

-Armadillo
It would be a neat trick but the weights shown have not been tampered with in any way

EDIT:



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Old October 30th, 2016, 03:39 AM   #227
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I just noticed that these are NOT 608 22mm bearings, but rather the much lighter 16mm size micro bearings. Still, these wheels with 688 bearings installed are same weight as the RB Turbos without bearings.

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Old October 30th, 2016, 03:43 AM   #228
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I just noticed that these are NOT 608 22mm bearings, but rather the much lighter 16mm size micro bearings. Still, these wheels with 688 bearings installed are same weight as the RB Turbos without bearings.

-Armadillo
8mm axle micro (688) and 7mm axle micro (167). Quite light, very nice wheels
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