[modeleng] Re: Renold jig chain
- From: Jeff Dayman <jeffdayman@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 22 May 2013 18:00:48 -0400
When I first saw the chain jig I realized that it would be just the thing to
drill a lot of fairly accurate holes at a regular pitch distance very
quickly. This would have been mighty handy in 1941 when the brochure was
published, for building riveted construction aircraft. At the time of
course, aircraft builders were looking for any trick or technique to get
planes in the air faster than they could be shot out of it. As to the chain
making a mark on the panel, that issue could be easily overcome with a bit
of paper or masking tape laid down on the panel before placing the chain
jig.
Unless you are making a homebuilt aircraft I don't think the idea is all
that useful in the shop today, unless you can find chain of the right pitch
for rivet lines in tanks and tenders. These days with DRO's or just home
shop mills with dials on the screws, it may be just as fast to do large
patterns of holes that way. Another method I use for sheetmetal layouts is
to model the item in CAD, print it out full size, stick the print to the
metal with spray adhesive, and centre punch / centredrill / drill directly
on / through the paper centre marks.
Cheers Jeff Dayman
----- Original Message -----
From: "Terry Lane" <tel.47@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, May 22, 2013 5:20 PM
Subject: [modeleng] Re: Renold jig chain
> Not at all Possum Muncher, you drill through the empty spaces, not the
> rollers!
> On 23/05/2013 7:08 AM, Jesse wrote:
>> Look Kangaroo lover, but it seems to me that the hardened chain would
>> dull most any drill including solid carbide.
>>
>> Jesse
>>
>>> Pay attention Unk! The chain is used as a spacing jig on curved surfaces
>>> for laying out rivet holes or whatever!
>>>
>>> On 23/05/2013 6:55 AM, Jesse wrote:
>>>
>>>> For why are we wanting to drill this type chain. FWIW, I built a nice
>>>> chemical dip vat for treating lumber against mold and insect damage.
>>>> The
>>>> vat would hold a large pack of lumber , automatically lower it into the
>>>> chemicals and after a few minutes raise the pack up to allow excess
>>>> chemical to drain off. After about a year or so of flawless operation,
>>>> the chain broke. I checked with chain manufacturer and was told that
>>>> the
>>>> chemicals would penetrate the hardened steel chain links and make them
>>>> brittle. The chemicals would have no effect on soft iron chain
>>>> according to the chain company, but they did not make multiple link
>>>> chain except for the hardened type. The chain, BTW was about six links
>>>> wide and was the type used on some fork lift trucks.
>>>>
>>>>
>>>>> 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
>>>>>>>> MODEL ENGINEERING DISCUSSION LIST.
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