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  #11  
Old 04-14-2020, 06:51 PM
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BEC BEC is offline
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Fair enough....but even though I'm a little older than you, I hope to get at least another 20 years or so of use out of it.
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  #12  
Old 04-14-2020, 10:06 PM
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Quote:
Originally Posted by BEC
Fair enough....but even though I'm a little older than you, I hope to get at least another 20 years or so of use out of it.


Bernard,

I donít have one, but Iíve spent many thousands of $ on Festool woodworking tools from Germany.

One way I rationalize them ó they are horribly, ridiculously, absurdly expensive when you use them the first time. After that, they donít cost any more than lesser tools.
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  #13  
Old 04-18-2020, 10:36 AM
aiglesia aiglesia is offline
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Quote:
Originally Posted by Gus
Bernard,

I am fascinated by your spring steel gizmo holding the fin to the platen. Can you explain it a bit and maybe get me a photo from the side. Looks like a really good idea for larger fins.

I think that those springs are constant force springs.
You can buy them on McMaster Carr in many sizes and strengths
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  #14  
Old 05-09-2020, 12:07 AM
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Default Even works for MMX models

I don't know if Art Rose planned it this way or if it's just lucky happenstance, but the shaft which carries the mandrels is a pretty close fit to a MicroMaxx motor tube. Just a touch of blue tape is required to make it a snug fit.

Semroc MMX Goblin getting its last fin on earlier today:
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  #15  
Old 05-13-2020, 04:25 PM
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Quote:
Originally Posted by ghrocketman
I understand the need for these in competition models.
For sport I do not in the least.


Simple economics . . . If you just dropped $400-$500 on one of these units, you had better USE it, as OFTEN as possible !

Dave F.
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  #16  
Old 05-13-2020, 04:30 PM
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Quote:
Originally Posted by Gus
Price through ebay is $500. ~$100 less if you contact me and I put you in touch with Dan.

Mandrels are 10.5 mm, 13 mm, 18 mm. (BT-4, BT-5, BT-20) Larger mandrels are available for an additional fee upon request.


Question . . . How much extra would a 24mm and a 29mm Mandrel cost ?

Dave F.
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  #17  
Old 05-13-2020, 07:01 PM
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Dave,

24 mm mandrels are $30 and 29 mm are $45.

Dan currently has a couple of the 24's on hand but he would need a couple weeks to crank out a 29 mm.

Steve
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  #18  
Old 05-13-2020, 07:11 PM
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Quote:
Originally Posted by Gus
Dave,

24 mm mandrels are $30 and 29 mm are $45.

Dan currently has a couple of the 24's on hand but he would need a couple weeks to crank out a 29 mm.

Steve


Thanks, Gus !
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  #19  
Old 05-13-2020, 07:34 PM
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Quote:
Originally Posted by Ez2cDave
Simple economics . . . If you just dropped $400-$500 on one of these units, you had better USE it, as OFTEN as possible !

Dave F.

Yup....and ever since I got it I have used it on every build for which that was possible. I have one in the queue where I won't be - that crazy Estes side-by-side cluster Sidekick. It seems like there's been one other in recent times that I didn't use it, but I'm not sure what that was.
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  #20  
Old 08-22-2020, 10:00 PM
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Okay, I went and bought a Harrison Fin Jig along with the 24mm and 29mm mandrels.

Dan was good to work with and has excellent service.

Shipped on Monday, arrived on Saturday (29mm mandrel will ship this Monday).

Interesting gadget that's for sure.

I guess I had better build a rocket and try it out.

Now that I have one of these devices I am awaiting the appearance of THE Monolith before me which will signal higher rocketry beings (Hard-core NAR competitors? Internats fliers? Elon Musk?) that I have advanced up the rocketry evolutionary scale.
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