Re: Socket headed cap screws
- From: John Stevenson <john@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 26 Oct 2005 13:24:26 GMT
On Wed, 26 Oct 2005 12:59:52 +0000 (UTC), "Andrew Mawson"
<andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>"Peter Neill" <panuno95-ukrec@xxxxxxxxxxx> wrote in message
>news:1130325099.754115.150840@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> mangled...@xxxxxxxxx wrote:
>> > Hi,
>> >
>> > Can anyone tell me how these are manufactured and if there is a
>> > reasonable way of making them in a home workshop ? (Yes, I know
>it's
>> > cheaper to buy them, I'm just curious... ;-)
>> >
>> > Thanks,
>> >
>> > David
>>
>> Hi David
>>
>> Most bolts are made by cold-heading and then thread rolled. A coil
>of
>> wire of the appropriate diameter is fed through from the back of a
>> collet type chuck which then grips tightly while a shaped heading
>> 'hammer' whacks down onto the free end to hob the hex/philips/cheese
>> head form. The collet then releases and feeds the wire forward to
>the
>> required thread length, then a chisel type head comes in from the
>side
>> and shears it off.
>> The blanks are then rolled down an inclined channel lined with
>thread
>> chaser plates on each side which spin the shank and roll the thread
>> form onto it.
>> I saw this years ago in Birmingham when I was in the automotive
>> industry and was quite amazed by it, although I have to say that it
>> takes second place to the even more amazing automatic spring
>formers.
>> Don't know whether you could replicate this at home though, short of
>> turning a blank and then sparking the hex form in, or using a tiny
>> cutter and a dividing head to set the hex shape up.
>> HTH
>>
>> Peter
>>
>
>David,
>
>Tony Phillips showed me a very interesting device for forming
>hexagonal (or indeed square) blind holes in the SM&EE workshop at the
>recent Midlands exhibition at the Fosse.
>
>Held in the tailstock it consisted of a chuck free running on a thrust
>race which was itself on a dovetail to adjust offset and mounted at a
>slight angle to the axis of the tailstock so it pointed 'crossing the
>axis'. In the chuck was a cutter whose cross section was hexagonal,
>but tapering rearwards to give relief.
>
>I didn't actually see it cutting, but as I understand it the work is
>held in the headstock, drilled with a hole the a/f of the hexagon and
>the tailstock device brought up and feed applied using the tailstock
>feed wheel. The work rotates the free running chuck 'walking' the
>cutter round the hole and cutting with a shaping action.
>
>I made a mental note to get more details from Tony when he next comes
>to Marshall House.
>
>AWEM
>
Do a search for wobble broach.
--
Regards,
John Stevenson
Nottingham, England.
Visit the new Model Engineering adverts page at:-
http://www.homeworkshop.org.uk/
.
- Follow-Ups:
- Re: Socket headed cap screws
- From: Andrew Mawson
- Re: Socket headed cap screws
- References:
- Socket headed cap screws
- From: mangled_us
- Re: Socket headed cap screws
- From: Andrew Mawson
- Socket headed cap screws
- Prev by Date: Re: Socket headed cap screws
- Next by Date: Re: Socket headed cap screws
- Previous by thread: Re: Socket headed cap screws
- Next by thread: Re: Socket headed cap screws
- Index(es):
Relevant Pages
|
