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Author Topic: Hohner 490 Project - Fretwork Grille - Reverse Engineering  (Read 3259 times)

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Mark Leue

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #20 on: April 24, 2019, 11:37:12 PM »

It's a simple job to cut  a grille out on a jigsaw and a little clean up with  files. You just need a pattern.  You may  have seen the replacement fingerboard I did last month I made a layout jig on my brothers milling machine the last time I was there, intending to reproduce the entire set up in polycarbonate that I can then use a router to reproduce in wood, Lasers are great, though. I'm just used to making things with regular woodworking tools.
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #21 on: April 25, 2019, 06:52:49 AM »

You just need a pattern 

That's what draughtsmen do: Draw out the patern to a defined geometry which can be replicated by tradesmen.
 (NB In Scotland the distinction between a craftsman and a tradesman is that the craftsman makes his own specialist tools whereas the tradesman purchases his ready made).

PS- Nice piece of work Mark. Thanks for sharing.
« Last Edit: April 25, 2019, 07:00:18 AM by Peadar »
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Mark Leue

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #22 on: April 25, 2019, 12:13:57 PM »

Here in the US you wear every hat at once, draughtsman, craftsman, engineer, floor sweeper...
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #23 on: April 28, 2019, 07:30:44 PM »

After far too many hours on the drawing board and CAD...a template to make a replica Hohner No.490 grille is produced.

The reverse engineering wasn't over succesful and I was reduced to crude curve fitting techniques to approximately transfer the fretwork onto CAD. The original geometry would have been be set out with compasses and rules and squares to specified nominal dimensions, in this case I completely failed to determine the actual geometry.

However I do have a drawing file which should be fit for feeding through the control software of a laser cutter. Not sure when that will happen so watch this space.

 In the meantime for those that are interested here is a pdf of what I have got so far..








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invadm

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #24 on: April 28, 2019, 08:17:02 PM »

PDF looks good to me 
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #26 on: September 17, 2019, 09:59:15 AM »

If I'm not mistaken, I have one of those in my cupboard! It looks in a similar condition, though. If anyone on our side of the pond is looking for one, drop me a line. We're currently away for a few days, so I cannot actually check it to see if it is exactly the same, but I seem to remember it as being so.
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #27 on: September 19, 2019, 10:44:27 PM »

If I'm not mistaken, I have one of those in my cupboard! It looks in a similar condition, though. If anyone on our side of the pond is looking for one, drop me a line. We're currently away for a few days, so I cannot actually check it to see if it is exactly the same, but I seem to remember it as being so.
Don't tempt me. Please don't tempt me!!!!

But if yours still has it's grille mostly intact a good square on photo of the grille/scan of the grille would be really useful.
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #28 on: September 19, 2019, 11:05:57 PM »

I'll try to dig it out tomorrow.
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #29 on: September 19, 2019, 11:13:26 PM »

I'll try to dig it out tomorrow.
That would be terrific.Thanks.

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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #30 on: September 20, 2019, 09:39:13 PM »

Sorry Peader, it slipped my mind until I got  back from choir practice just a while ago. Never mind, here we go!
The grille is 9 & 13/16 long and 4 & 9/16 wide. The wood is 3/16 thick. As you can see, the lettering is different in that it says M. Hohner Accordeon, it's in C, btw. Hope these are OK for you.
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Jeremy Burnett

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #31 on: September 21, 2019, 04:45:49 PM »

Theo has a club 1 for sale that has a grille that looks very similar to that required.
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #32 on: September 21, 2019, 05:28:35 PM »

I'd fancied that a 2 row grille might be too big, and I'm relatively certain that a Club one would be. The club boxes which I've had were definitely bigger than this old 1 row I've pictured. (Not counting the Liliputs, obviously.)
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Pete Dunk

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #33 on: September 22, 2019, 08:43:49 AM »

It would be interesting to see the makers brand lettering on your box.

Apologies for the delay, I missed your post. Here's a pic of the box front, no sign of any prizes being won.
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #34 on: September 22, 2019, 09:46:01 AM »

Now that I've got this thing out of the pile, I've been having a better look at it than I've had before. The fretwork on the grille is pretty awful, it's nowhere near being symmetrical. I didn't notice it at first glance, but it certainly doesn't stand close inspection!
Perhaps the best thing going for it is that it's complete apart from the central screw in the grille being absent.
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #35 on: September 23, 2019, 12:21:15 AM »

Pete: I think your box is contemporary with my 490 (est 1908-10). The Font of the M. HOHNER branding matches mine, as do the side hooks.

Winston:I think your 490 is older - Same font as on the 1904/1905 boxes. The side hooks are also of a standard (Klingenthal?) form- straight bar with circular ends. You may just  be owner of one of the first Hohner accordeons ever made.

I am unsurprised at the grille being less than symetrical. They were said to be craftsman made:   For which read a bloke on piece work,  with a tin (probably actually galvanised) template , a carpenter's pencil, a lineshaft driven jigsaw in front of him and a pile of blanks behind him..
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #36 on: September 23, 2019, 09:27:18 AM »

Peader, thanks for your info, interesting without doubt. But I think that the words "craftsman" and "piecework" could be strange bedfellows!
Is the grille picture any use to you?
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Winston Smith

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #37 on: September 23, 2019, 10:20:52 AM »

How strange! I came across this old beastie a few minutes ago, with the same pattern (and also non-symmetrical) grille:

https://www.ebay.co.uk/itm/Very-old-2row-diatonic-button-accordion-M-Hohner-Cotillon-Fanfare/133176494976?hash=item1f01f00b80:g:ig8AAOSwZIldgpLa

I'm wondering, however, if this is wholly a product of the Hohner factory, or whether the bellows  have been replaced with someone else's? Cotillon Accordeon Fanfare on the corner plates and Cotillon Accordeon on the bellows ends looks a tad suspicious to me.

(Or am I drifting a little too far away from your thread here, Peader?)
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Peadar

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Re: Hohner 490 Project - Fretwork Grille - Reverse Engineering
« Reply #38 on: September 24, 2019, 11:48:52 PM »

I will come back to you on that.
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