[modeleng] Re: Screwing the job up

Hi Peter

Take heart, there really is nothing to screwcutting once you get the hang of 
it.  Don't use a die, other than to finish off a thread, if you can help 
it - you will always get a discernible pitch error over a long length of 
thread.  8" is far to long to die down and expect an accurate result.

----- Original Message ----- 
From: "Peter Sheppard" <peter.sheppard@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, April 18, 2005 2:33 PM
Subject: [modeleng] Re: Screwing the job up


>
> Hello Rich,
>
> That's a good idea.  However the design (as far as this was designed .v. 
> thrown
> together!) had a 5/16 piece of plain bar that fitted neatly through a 
> standard
> bearing.
>
> The motor is from radio spares (413-0593) and it has metal gears.  They 
> are
> very similar to the ones used by the North Wilts ME on their point 
> machines.
> It shouldn't "slam" to a stop as I plan to have microswitch at the end of 
> the
> movement to cut off power before that point is reached and then (through 
> the
> electrics) the motor could only be reversed.
>
> For the moment I'll try the screwcutting again tonight.
>
> I did run the die down #3 last night and about half way down it started 
> tearing
> into the thread.
>
> So, I'll check everything again (changewheels etc.) and try screwcutting 
> again
> tonight.
>
> Cheers
>
> Peter
>
>
> On Monday, April 18, 2005 1:53 PM, R.L. Roebuck [SMTP:rlr20@xxxxxxxxxxxxx]
> wrote:
>> Okay - so why not use M16  - thats got a pitch of 2mm, and a diameter
>> thats practically 5/8". Available from most hardward shops as
>> well (although not places like B & Q I don't think).
>>
>> One thing - how powerful is your motor and it's gearbox - is it up to
>> spinning a lump of metal like this, and when it tries to stop it, will it
>> loose a geartooth?
>>
>> Yours,
>>
>>
>> Rich.
>
>
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