Pin gages

[GravityX]

I've been thinking about getting some pin gages, but I have few questions. What range of sizes should I get to measure out the axle bores? Also, where would be a good place to purchase these gages?

Another thing. When measuring, what is the optimal bore size being sought? Or better yet, what is an optimal clearance for final setup? I realize this is dependent upon other factors during the build, but I'll leave that for another topic.

Thanks guys

____________________

GOALS:

First step: Sub 3.000... √ , Step two: Sub 2.9700... √ ,
Step three: Sub 2.9600... SS Class, Upcoming Milestone: 2.9499... SS Class (√ SP Class)
Sub 2.9200... SP Class

 

[bracketracer]

Gravity,
I bought mine from McMaster-Carr. I use .0960, .0965, .0970, .0975, and .0980 pin gages to sort stock BSA wheels. I haven't had a stock wheel larger or smaller than those sizes. I use the no-go size here: http://www.mcmaster.com/#23065a504/=nge5u8. Some of the sizes I bought were special order, only took a few extra days to come in.

I don't have enough experience to quote you an optimal bore clearance, but I have been told it's around .004- .006".

 

[5KidsRacing]

I have these sets:

http://www.ebay.com/itm/190-M1-061-250-STEEL-PLUG-PIN-GAGE-SET-MINUS-PLUS-NEW-/350727698242?pt=LH_DefaultDomain_0&hash=item51a8fff742

and

http://www.ebay.com/itm/50-M0-011-060-STEEL-PLUG-PIN-GAGE-SET-MINUS-PLUS-NEW-/300900034079?pt=LH_DefaultDomain_0&hash=item460f0a261f#ht_2686wt_978

I use a lot of them all the time.

 

[Guest]

Can these PIN's be used with the Silver Bullet to change the angle of the rear cant? I remember see something in another post about that.

 

[5KidsRacing]

Can these PIN's be used with the Silver Bullet to change the angle of the rear cant? I remember see something in another post about that.

Yes, but I don't think anybody has ever made a chart showing the pin size vs. cant angle for the Silver Bullet. I could be wrong... I know Exorcist3D did one for the old style The Block.

If I knew the angle and depth of the "V" groove in the Silver Bullet I could make one, but I don't know that info...

 

[ZZ Racing]

Can these PIN's be used with the Silver Bullet to change the angle of the rear cant? I remember see something in another post about that.

Yes, but I don't think anybody has ever made a chart showing the pin size vs. cant angle for the Silver Bullet. I could be wrong... I know Exorcist3D did one for the old style The Block.

If I knew the angle and depth of the "V" groove in the Silver Bullet I could make one, but I don't know that info...

Contact John he has the list your looking for.

 

[GravityX]

Thanks for the info guys!

____________________

GOALS:

First step: Sub 3.000... √ , Step two: Sub 2.9700... √ ,
Step three: Sub 2.9600... SS Class, Upcoming Milestone: 2.9499... SS Class (√ SP Class)
Sub 2.9200... SP Class

 

[JC]

 

[JC]

could you use a digital caliper and just find the right size q'tips i know some boxes are over the place in size.

 

[Rocket car]

You could. Welcome to the forum!!!

 

[quadad]

And as you get crazier and crazier, you order the 1/2 sizes in-between the standard sizes for those in the wheel bore area.

Local distributors will sometimes order these (for a couple of bucks) without any shipping charges.

 

[down4derby]

Ok I understand checking bore size on raw wheels. I've never used pin gauges before, are they necessary for machined wheels? I could see using them if you had a few sets of the same type of machined wheels. Seeing as I only have 1 set of v3 cheetahs do I need pin gauges? Are you guys reaming your machined wheels? Out of a set where would you place your tightest bore, dfw, rears?

 

[GravityX]

I may be wrong on this, but I am putting the "tightest" bores on the rears. I'm trying this idea this time around, we'll find out Saturday if my thinking is correct. /images/boards/smilies/confused.gif

Out of a set where would you place your tightest bore, dfw, rears?

 

[quadad]

If anyone is still looking for a silver bullet cant angle vs. pin diameter chart ... you don't really need one. The "Angle Finder" sheet that John provided long ago with my silver bullet is great for knowing what diameter all those wire gauge and metric pins are, but once you have that the relationship between the cant angle produced and the pin diameter (using John's data) is totally linear. Here is what I see it as:

Cant Angle (degrees) = 56.09 * Pin Diameter (inches) - 4.1093

 

[HMH Racing]

That is very helpful, thanks. I ordered a pin gage set the other day and was wondering how some of the conversions on the chart would work.

 

[GravityX]

Cant Angle (degrees) = 56.09 * Pin Diameter (inches) - 4.1093

Awesome! So based on this information... a .125" (1/8") pin gives you a 2.90° drill angle. I haven't searched anywhere yet, but where do the constants come from in the equation?

 

[quadad]

Cant Angle (degrees) = 56.09 * Pin Diameter (inches) - 4.1093

Awesome! So based on this information... a .125" (1/8") pin gives you a 2.90° drill angle. I haven't searched anywhere yet, but where do the constants come from in the equation?

I just plotted a bunch of the data (not all) from John's table into MS Excel and saw that it laid out perfectly as a straight line. Excel determined the coefficients. And yes, John's chart lists 1/8" size pin gives you a 2.9 degree angle.

 

[GravityX]

Cant Angle (degrees) = 56.09 * Pin Diameter (inches) - 4.1093

Awesome! So based on this information... a .125" (1/8") pin gives you a 2.90° drill angle. I haven't searched anywhere yet, but where do the constants come from in the equation?

I just plotted a bunch of the data (not all) from John's table into MS Excel and saw that it laid out perfectly as a straight line. Excel determined the coefficients. And yes, John's chart lists 1/8" size pin gives you a 2.9 degree angle.

Thanks!