Surf Rodz Community Measurements

I will, I thought they were kinda crazy too but I double checked when doing the measurements. Its fairly consistent in that 1 side is longer than the other two sides. Like I said, mine are all 2 years or older so they may be from a a different batch of stock or something.

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If those measurements are right I wonder what the hole concentricity is and what the hole size is. that bar would spin off axis in the machining center.

Id send them to you if I had replacements, unfortunately I dont. One set is going to be replaced eventually with some precision RKP trucks, but I dont know when.

I’ve got a set of TKP’s sitting around now along with a spare hanger.

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The excel is here if you’d like to play along

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I’ve got tkp hangers close by in Philly.

I can measure the 177 and 149 hangers I have

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Still no photos added above I did this if it helps but my callipers are just a cheep set don’t know if that’s good enough and only really trust them down to 0.1mm

Most of the meserments are coming at 18.03-18.07 for RKP200
Road side of the hanger is more 18.05-18.07
Board side of the hanger is more 18.03-18.05

The variation of 0.03 is most likely down to the lack of accuracy of my callipers

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yep. that’s perfect!

I forgot to add the pics. :expressionless:

Are different calipers really so accurate that you can trust the measurement comparisons without calibrating them (calipers) to a reference or each other?

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Id trust almost all calipers that aren’t deformed/shoddy

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Thats why the spreadsheet rounds to the first significant digit. Short of starrets etc i dont trust anything past 1/10th of a mm.

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Here mine :blush:

TKP 177mm
(19.06,19.07,19.07)
(19.06,19.06,19.08)

RKP 200mm
(18.11,18.10)
(18.01,18.06)

For the TKP I aspected a lot of variability since I guess they start from a 6 faces rod, but for the RKP that’s quite a lot. Those are tollerence for production run and of course as a classic truck they won’t affect the integrity so it’s understandable why they do it. They probably only kept good tollerance where matters to minimized cost.

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Just as good practise, so that everyone measure it properly with a caliper and gives accurate results. Whenever is possible measure the parts with the thicker part of the caliper, that has more contact surface and clearance for edges at the back. The front thin section is there for the situations where the space is limited but it is easier to make mistakes. In this case that is a finished part it will probably give the same reading with the given attentions, but always better to avoid to include edges in measurments :slightly_smiling_face:

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Thanks for the advice most of my meserments I make at work are standing still looking out thinking that’s about 12m away and I need 32m of cable to get there if I go xyz way this hole less than a mill thing is new to me

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127mm TKP - other hanger has motor mounts in the way
(19.12, 19.10, 19.15) (19.06, 19.08, 19.09)

200mm RKP
(18.08, 20.56) (18.08, 20.63)

150mm RKP
(18.28, 22.27) (18.29, 22.51)

Hard to get consistent with rkp since the hanger widens out from the end to the middle. Tried my best at the very edge of the flat spots on the hanger before it chamfers down.

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200mm RKP
(18.0, 18.0), (18.0, 18.0)

Pretty damn consistent, although maybe I’d see variation with better calipers.

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