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Austrailian bipolar driver Kits

 

I bought the K109 two axis driver kit. I am assuming it runs on
step/dir based on the description of the K142 (the two are supposed to
be very similar) I will let everyone know how it goes together. I was
a little skeptical about the 14 amp claim myself and I am wondering what
needs to be heatsink-ed and how much? Just the switching FET's ? I
have zero board building experience so the probability of frying this
board is high I am afraid.
If I send out the circut diagram and component list would that be
worthwhile? Should I get permission from Oatley?

Mariano, is there any way you can get me an email copy of the
article on the Oatley boards you mentioned?
Darrell
 

Joe,
I bought one of the Oatley single axis boards on the claim of 80+ volts and
10+ amps. When I asked them for specific instructions on how to set things
up for 8 amps using an 80 volt power supply they said it would take major
modifications and offered to take the kit back for a full refund. It looks
like you have to replace all of the MOSSFETS, add heat sinks to everything
that carries any current and the amperage is controlled by resistors (it is
not a chopper driver) so you need some high watt resistors with heat sinks.
For small motors, it looked like an ok board.
Darrell

----- Original Message -----
From: Joe Vicars <jvicars@...>
To: <CAD_CAM_EDM_DRO@...>; <diazden@...>
Sent: Monday, March 06, 2000 6:43 AM
Subject: [CAD_CAM_EDM_DRO] Austrailian bipolar driver Kits


From: Joe Vicars <jvicars@...>

I bought the K109 two axis driver kit. I am assuming it runs on
step/dir based on the description of the K142 (the two are supposed to
be very similar) I will let everyone know how it goes together. I was
a little skeptical about the 14 amp claim myself and I am wondering what
needs to be heatsink-ed and how much? Just the switching FET's ? I
have zero board building experience so the probability of frying this
board is high I am afraid.
If I send out the circut diagram and component list would that be
worthwhile? Should I get permission from Oatley?

Mariano, is there any way you can get me an email copy of the
article on the Oatley boards you mentioned?


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In a message dated 06-March-00 15:40:28 Central Standard Time,
jvicars@... writes:

<< From: Joe Vicars <jvicars@...>

Any idea what it's good for? 1.5 A per phase? >>

Not sure of the "complete question", so, here's at least a "partial answer":
See the ST L298 "dual full-bridge driver" which is a "multiwatt" package
(kinda like a wide t0-218 with 15 leads).
 

Try "TO-218". Duh...
 

Any idea what it's good for? 1.5 A per phase?
Darrell
 

I remember the instructions had a value in amps that was the limit before
you needed heat sinks. I think heat sinks were only required above 2 amps.
I am working with Bridgeport CNCs and they have about 80 volt power supplies
and the motors draw 8 amps.
Darrell

----- Original Message -----
From: Joe Vicars <jvicars@...>
To: <CAD_CAM_EDM_DRO@...>; <dgehlsen@...>
Sent: Monday, March 06, 2000 2:42 PM
Subject: Re: [CAD_CAM_EDM_DRO] Austrailian bipolar driver Kits


From: Joe Vicars <jvicars@...>

Any idea what it's good for? 1.5 A per phase?


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Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
To Unsubscribe, read archives, change to or from digest.
Go to:
Log on, and you will go to Member Center, and you can make changes there.
For the FAQ, go to
bill,
List Manager
 

My 2A kit uses those L298's they are a fine chip but they really need a
heatsink over 1A. At 2A better make sure you have a good large heatsink and
a fan.
Dan

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