[modeleng] Re: Renold jig chain
- From: Terry Lane <tel.47@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Tue, 21 May 2013 07:03:04 +1000
Rather than trying to drill directly through the chain, might I suggest
that an appropriately sized spotting drill be used to start the holes,
the chain then removed and the drilling completed in the usual way. And
yes, I can see there would be real problems with trying to get the chain
tight on a flat surface.
On 21/05/2013 6:49 AM, R.L. Roebuck wrote:
> Yes, though I would suggest experimenting might be the key word:
>
> 1) If you have a piece of hardened steel chain across a piece of brass
> sheet - I reckon you'd end up with some marks on the brass after you've
> vibrated the chain for a couple or hours drilling holes, though I might be
> wrong...depends on your requirements for the finish of the metal maybe.
> > From memory, aircraft gurus don't usually like marks on their panels as
> the lead to cracks.
>
> 2) Does the original concept require the surface to be curved in order to
> hold the chain taught against it, else it will keep being 'lifted up' by
> the flutes of the drill...which would suggest it only good for aircraft
> work, or for our work on occasionally curved surface, like the smokebox.
> (Compare with a tightrope for example - never completely horizontal, it
> always dips to the point where the acrobat is stood...if it were
> completely horizontal, it can carry no vertical, or in our case clamping,
> load).
>
> It does look interesting, but I wonder if the above reasons are why
> it isn't a complace fixture, as it rules it out for most work?
>
> All the best,
>
>
> Rich.
>
> On Tue, 21 May 2013, Terry Lane wrote:
>
>
>> Can't see why not - might be worth a bit of experimenting.
>>
>> On 20/05/2013 9:10 PM, Clifton wrote:
>>
>>> Hi Jerry and All,
>>>
>>> It's an interesting concept. I wonder if it could be adapted to modeling by
>>> using a smaller chain gauge?
>>>
>>> Clif
>>> ----- Original Message -----
>>> From: "Jerome Kimberlin"<kimberln@xxxxxxxxxxx>
>>> To:<modeleng@xxxxxxxxxxxxx>
>>> Sent: Monday, May 20, 2013 1:04 AM
>>> Subject: [modeleng] Renold jig chain
>>>
>>>
>>>
>>>
>>>> I don't suppose these are being made today since CNC can do the job, but
>>>> has anyone ever seen one of these drilling jigs?
>>>> http://www.flightglobal.com/pdfarchive/view/1941/1941%20-%202010.html
>>>>
>>>> Seems like it would be useful for model engineers who like those little
>>>> pimples on tenders, etc.
>>>>
>>>> JerryK
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>>
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