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Author Topic: What alum footing size for FMJ 400?  (Read 214 times)

Offline TRAP

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What alum footing size for FMJ 400?
« on: July 10, 2013, 12:29:00 PM »
Will a 2020 work?? A 2018 seems too big?  

Thanks, Trap
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Offline JimB

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Re: What alum footing size for FMJ 400?
« Reply #1 on: July 10, 2013, 12:33:00 PM »
Do you have any idea what the actual shaft diameter of the FMJ is?
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Offline RLA

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Re: What alum footing size for FMJ 400?
« Reply #2 on: July 10, 2013, 12:37:00 PM »
I think I remember reading they take 1916 but I could be wrong? I wish I had the right size as I just built some myself & would try my hand at footing.

Here we go,

  http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=2;t=000098
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Online Tater

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Re: What alum footing size for FMJ 400?
« Reply #3 on: July 10, 2013, 02:36:00 PM »
I foot mine with 2018's and have no problems makes a real durable arrow.
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Offline Jakeemt

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Re: What alum footing size for FMJ 400?
« Reply #4 on: July 10, 2013, 05:27:00 PM »
wouldn't footing be somewhat redundant on an fmj? As I understand it is a carbon fiber shaft with an aluminum sleeve.
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Offline iohkus

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Re: What alum footing size for FMJ 400?
« Reply #5 on: July 10, 2013, 05:55:00 PM »
The FMJ 400 is .261" O.D. 1914's with an inside diameter of .2689" would be very close to ideal.
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Offline TRAP

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Re: What alum footing size for FMJ 400?
« Reply #6 on: July 10, 2013, 05:56:00 PM »
I suppose it would be redundant, but I'm gonna foot it to reduce the chance of mushrooming and to make a better head to shaft transition.

Trap
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"If you don't like change, you're going to like irrelevance even less" Gen. Eric Shinsheki

"If you laugh, and you think, and you cry, that's a full day, that's a heck of a day." Jim Valvano.

Offline iohkus

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Re: What alum footing size for FMJ 400?
« Reply #7 on: July 10, 2013, 06:11:00 PM »
Just measured the FMJ 500. It has an O.D. of .255". Didn't realize there was a difference. Those are the only two sizes I have, so can't say about the other sizes' O.D.
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Offline JimB

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Re: What alum footing size for FMJ 400?
« Reply #8 on: July 10, 2013, 06:18:00 PM »
If .261 is the OD,1916 may also work at .2649 ID and 2020 is .2725,
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Offline iohkus

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Re: What alum footing size for FMJ 400?
« Reply #9 on: July 11, 2013, 04:57:00 PM »
The 1916 may work, but it would be pretty tight. I don't remember where I got this recommended tolerance list, but it was on this subject:
     .0073 perfect
     .0052 too tight
     .0129 too sloppy
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Offline JimB

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Re: What alum footing size for FMJ 400?
« Reply #10 on: July 11, 2013, 05:04:00 PM »
That may be right.I've made some work that were awfully close but it does help to have a little clearance.If cutting with a tubing cutter,the ends get pinched in a little,no matter how careful you are or how well you deburr the piece.

You sometimes just have to try a sample.I've found some to fit that shouldn't,according to Easton's figures and vice versa.

The tolerance list could come in very handy.I had not seen that before.Thanks.
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Offline proprod

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Re: What alum footing size for FMJ 400?
« Reply #11 on: July 12, 2013, 06:21:00 AM »
You may want to consider the broad head adapter ring they offer for the FMJ. BAR3 is the size spec'd out on the FMJ website.
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Offline DarkTimber

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Re: What alum footing size for FMJ 400?
« Reply #12 on: July 17, 2013, 09:30:00 AM »
Dayrl,  Not sure if you've already bought your footing material or not but I just got some 1914s to foot my Axis 340s and I checked them on some FMJ 400s I have and they fit very well.
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