[modeleng] Re: Where are you all?

No problem but wont be til end of next week as I am now at work for six 
days.

Regards

Julain.

----- Original Message ----- 
From: "Shep" <shep.28@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, September 18, 2008 10:31 AM
Subject: [modeleng] Re: Where are you all?


> Hi Julian
>
> Thanks for your sage advice - my knowledge of electricity and electronics 
> is
> abysmal!
>
> If you find the references in ME I should be glad to have them.
>
> Thank you again
>
> Cheers!
>
> Hubert
>
>
> ----- Original Message ----- 
> From: <julianharrison7@xxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Wednesday, September 17, 2008 9:26 PM
> Subject: [modeleng] Re: Where are you all?
>
>
>> Hi Hubert,
>>
>> I am just building a heavy duty version of a train controller to control
>> the
>> speed of a fifteen amp dc motor. If you vary the voltage to the power
>> supply
>> you slow the motor but you also loose most of the torque. For the same
>> reasons if you vary the output voltage to slow the motor from 12v to 6v
>> for
>> instance you again loose most of the torque so the motor can stall very
>> easily.
>>
>> I am building a small electronic controller using a couple of 555 chips
>> and
>> large mosfet transistor to pulse the motor. The length and frquency of 
>> the
>> 12v pulses varies the speed without loosing any torque. There were some
>> simple plans for one in ME I think last year.
>>
>> Perhaps the better choice to better control your leadscrew would be a
>> stepper motor and controller. Drive directly or gear 2:1 and you shoiuld
>> see300-600rpm which is proibably far more than you need for the 
>> leadscrew.
>> The torque is better on steppers when they are run slower than full 
>> speed.
>> ArcEuro sell a controller for £28. It can be driven by a simple 555
>> control
>> circuit. Again plans are in ME from within the last 18 month. By
>> coincinence
>> I am also building one of these to drive the table on a seig X3 and one 
>> to
>> drive the leadscrew on my Seig lathe. If I get a chance to get into the
>> workshop tomorrow I can find the issue numbers for you if you want or if
>> you
>> can wait til I have built them can send u photos and diagrams.
>>
>>
>> Regards
>>
>>
>
> MODEL ENGINEERING DISCUSSION LIST.
>
> To UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
> line.


--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.169 / Virus Database: 270.6.21/1677 - Release Date: 17/09/2008 
17:07

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: