Further saga of the Bernina 950

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I have had more problems with my Bernina 950.
Having cured the  timing in May  I then had a broken cog in August. I  
then had a repeat of the looping of the  threads underneath which then  
threw the timing out on the machine in the beginning of December.

I finally got to take the machine to my service man, 2 hour round trip,  
on Tuesday and he fixed the timing while I waited. He is puzzled  as to  
why I having so much trouble with a Bernina.

So far he has only seen the machine alone and is now worried that my  
table mounted motor may be too big it's 2850 Revs per min. and he thinks  
this machine would be better with a motor that works at 1400.He thinks  
that the fast off the block start could be throwing the thread out of  
the tension discs.
The other thing we haven't ruled out is the tension block it seems good  
in general use but he wants me to check if I can pull the thread through  
the tension discs when  I get a birds nest underneath. Usually I am so  
wanting to unblock the machine that I haven't  checked that, I hope I  
won't have to.

I love this machine when it works well but I am reluctant to spend yet  
again to change the motor, it will be the best part of 500 ?uros. Does  
anyone think it's really going to make a massive difference? I  
understand my service man's theory but is it just clutching at straws  
for reasons ?
--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950


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Claire that motor is to fast for that machine. Remember the 950 is basically  
a home sewing machine. The low speed motor is advised. The high speed will  
sooner than later destroy the machine completely.

--  
Ron Anderson A1 Sewing Machine
18 Dingman Rd Sand Lake, NY 12153
We've slightly trimmed the long signature. Click to see the full one.
Re: Further saga of the Bernina 950
Ron Anderson wrote:
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Ron, I'm curious, is there no way to slow the motor down? Maybe a  
rheostat or something?  Or would that just make matters worse?

--  
Beverly
http://www.ickes.us





Re: Further saga of the Bernina 950
:Ron Anderson wrote:
:> [...] Claire that motor is to fast for that machine. Remember the  
:> 950 is
:> basically a home sewing machine. The low speed motor is advised.
:> The high speed will sooner than later destroy the machine
:> completely.

:Ron, I'm curious, is there no way to slow the motor down? Maybe a  
:rheostat or something?  Or would that just make matters worse?

Typical industrial sewing machine motor on older machines is an AC
induction motor.  They run at a fixed speed, based on the construction
of the motor and the frequency of the current they're fed.  Speed
control of the machine is managed by slipping a clutch.  (Why they're
called 'clutch motors'.)  It's possible to change the pulley on the
motor, fitting a smaller one will reduce the speed the machine is
driven.  

Nicer machines have servo motors, which have actual speed control, and
don't run at all times, and with the right options can allow things
like needle positioning.  




--  
sig 51

Re: Further saga of the Bernina 950
Le 08/01/2014 18:53, David Scheidt a écrit :

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I have a clutch motor.

My service man did mention possibly changing the pulley but it's not  
something he does . There is a motor and electrical workshop business in  
a nearby town , so if I can't get any joy  with an exchange motor with  
the original seller I will look into that option.

My service man did mention that there is not much difference between  
what I have and an electronique moteur which will be silent until I  
begin sewing, he also says that this will be easier to control stitch by  
stitch.

i will see what today's round of phone calls brings

--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950
Le 08/01/2014 16:35, Ron Anderson a écrit :

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Thank you confirming that Ron, I am going to call the business that  
originally sold me this 2nd hand machine . They have a lot of machines  
so I am hoping I can get them to exchange the motor for one that is  
appropriate. Of course this will not  easy with them in the UK and  
myself in France.

I will let you all know how it goes.
--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950


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Yes, if it was a sewing machine business that sold it to you, they should  
have never sold it with that motor.  The smaller pulley will decrease the  
maximum speed but depending on the size of the pulley that is there may not  
be enough.
A repair shop that will not change a motor pulley should be dumped as  
quickly as possible. It is a very simple thing to do.

--  
Ron Anderson A1 Sewing Machine
18 Dingman Rd Sand Lake, NY 12153
We've slightly trimmed the long signature. Click to see the full one.
Re: Further saga of the Bernina 950

:I have had more problems with my Bernina 950.
:Having cured the  timing in May  I then had a broken cog in August. I  
:then had a repeat of the looping of the  threads underneath which then  
:threw the timing out on the machine in the beginning of December.

:I finally got to take the machine to my service man, 2 hour round trip,  
:on Tuesday and he fixed the timing while I waited. He is puzzled  as to  
:why I having so much trouble with a Bernina.

The only thing 'Bernina' about a 950 is the sticker, and the price
sticker.  

:I love this machine when it works well but I am reluctant to spend yet  
:again to change the motor, it will be the best part of 500 ?uros. Does  
:anyone think it's really going to make a massive difference? I  
:understand my service man's theory but is it just clutching at straws  
:for reasons ?

In the US, a new variable speed servo motor is available for about
$125 US.  I'm sure they're available in Europe, but even shipping one
from china to the US to France will cost rather less than 500 euro.  
Any one of modest mechanical competence can install one, it
mounts to the table in the same way as the existing motor.  You'll
also probably need a new belt, of a different length.  Suitable belts
are available from hardware and auto parts stores; they're used on
all sorts of equipment.

--  
Truth is in your water heater.

Re: Further saga of the Bernina 950
Le 08/01/2014 18:05, David Scheidt a écrit :

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The price he has quoted is between 340 ?uros and 400?uros before TVA /  
value added tax which has just increased to 20% . As I am a small  
business I can't reclaim the tax. I will then have fitting on top.

Some items in France are very expensive , I have found since living here  
there is a lack of what I was used to know in the Uk of a recommended  
retail price. Prices vary  in  a big way so I may get it cheaper by  
shopping around however it takes an age to shop around . For example a  
grease gun for my husbands tractor varied between 5 ?uros and 35 Euros  
in a 50 Km radius

If the UK firm won't play ball I may look at importing one. At least I  
can comfort myself taht  my 2850 RPM motor will have a good value if I  
have to sell it on myself.  I will just have to hope I can get an exchange.

Thank you for your comments.
--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950
Claire, I don't know where in France you are, but did it ever occur to you  
that you might be closer to Steckborn, Switzerland, than your UK dealer?  
Perhaps it might be an option to turn to the headquarters of Bernina  
directly? As for buying - although I hate to say it, in some cases the net  
is better than real life. I got my Bernina Aurora 440 QE from a dealer in  
Bavaria, some 500+ km off, who made me a special price, about 25 % less than  
the recommended retail price. I found out since that this was due to the  
fact that it is a discontinued model.

I have to admit that I'm a bit out of touch with the actual problem you had  
but thought that my 2 c might be a valuable addition to the discussion. Beg  
your pardon if I missed the mark entirely. ;-)

U.  


Re: Further saga of the Bernina 950
Le 09/01/2014 16:20, Ursula Schrader a écrit :
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Ursula,

I am a fair way down in France  we are only 2 hours from the Spanish Border
https://maps.google.fr/maps?q=moulierous+montreal+du+gers&oe=utf-8&client=firefox-a&ie=UTF-8&ei=P8HOUsOYGeyr0gWY6YBo&ved=0CAoQ_AUoAg

I have found out that the motor seems to be all right as I have the  
smaller pulley, I am waiting to talk to the service man in the UK  
tomorrow in the hope that he can shed some light onto why I get this  
birds nest / looping problem.
This seems to be  what is causing the problem with the timing. The build  
up underneath in the bobbin area happens often and is blocking the  
bobbin and throwing the  timing out, even when I stop as soon as I hear  
it. Of course I can go for ages and have no problem at all, what I  
really have to narrow down is what is causing the  loping in the bobbin  
area. I think the service man was suggesting the motor as it could be  
starting too fast and throwing too much thread into the mix!!!

Ant thoughts and suggestions are always welcome. My guesses are entirely  
uneducated (Grin)

--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950


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That looping is a tension issue. Either no top tension or way too much lower  
tension. It could be bobbin backlash due to the high speeds, this is not  
uncommon. Could also be the thread finding its way out of the top tension  
disks.

--  
Ron Anderson A1 Sewing Machine
18 Dingman Rd Sand Lake, NY 12153
We've slightly trimmed the long signature. Click to see the full one.
Re: Further saga of the Bernina 950
Le 09/01/2014 17:05, Ron Anderson a écrit :

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That is my next area to eliminate , I will be watching the top tension  
discs like a hawk. The tension block itself seems to be OK but I have to  
check what's happening with it next time I get a birds nest.
Bobbin backlash is the suggestion of the UK firm that sold the machine,  
that  is to be looked at but I am watching the tension discs first.
--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950
:Le 08/01/2014 18:05, David Scheidt a écrit :

:>
:> In the US, a new variable speed servo motor is available for about
:> $125 US.  I'm sure they're available in Europe, but even shipping one
:> from china to the US to France will cost rather less than 500 euro.
:> Any one of modest mechanical competence can install one, it
:> mounts to the table in the same way as the existing motor.  You'll
:> also probably need a new belt, of a different length.  Suitable belts
:> are available from hardware and auto parts stores; they're used on
:> all sorts of equipment.
:>

:The price he has quoted is between 340 ?uros and 400?uros before TVA /  
:value added tax which has just increased to 20% . As I am a small  
:business I can't reclaim the tax. I will then have fitting on top.

Ebay shows suitable motors availalble for 150 pounds, which is 175 or
so euro, and that would the right electrical requirments.  (I looked
there for language reasons, nothing else.  They'll be available for
that price in France or germany or italy, too.)  Fitting is  
easy for anyone with basic mechanical and
electrical competence: it's a matter of remvoing the motor,  
installing the new one, and fixing the wiring.  (Many servo motors
have a regular cord and plug, insead of being wired into the swtich
box on the table, though you can wire them into that, if you want.
They also tend to not use the god-awful 6 v lamps that clutch motors
have, but provide a mains voltage outlet to plug a normal lamp in.)    

Anybody who can install a light switch or fix a washing machine can do
this, even if they have never seen a sewing machine before.

Your mechanic sounds either incompetent (can't change a pulley!?),
lazy, or he doesn't want you as a customer.  Whichever it is, I'd go
look for someone else.



--  
sig 94

Re: Further saga of the Bernina 950
Le 09/01/2014 22:46, David Scheidt a écrit :

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That  sounds interesting can you point me in the right direction (link?)  
please.

  Fitting is
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I can do both of those so no problem for that.

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I'm not sure where you got that impression from David. My service  man  
is great however he is a 2 hour round trip away, so fixing things does  
end up taking longer as I don't always go to that town.  He is also the  
only person in this area that is willing to look at a Bernina, French  
people seem to be  surgicaly attached to their Singers , there is  
nothing else for them.

The reason he hasn't changed the pulley or measured the pulley is that  
he hasn't seen the table and motor part of the machine yet. The three  
times I have had problems I have taken him the sewing machine itself. It  
was only while discussing with him on Tuesday that he started to query  
the motor as he realised that he hadn't seen it yet. So he sent me home  
to check the size of the motor , he mentioned that it should have a  
small pulley if it was the 2850 motor in order for it to be functioning  
correctly.
--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950
:Le 09/01/2014 22:46, David Scheidt a écrit :

:> Ebay shows suitable motors availalble for 150 pounds, which is 175 or
:> so euro, and that would the right electrical requirments.  (I looked
:> there for language reasons, nothing else.  They'll be available for
:> that price in France or germany or italy, too.)

:That  sounds interesting can you point me in the right direction (link?)  
:please.

http://www.ebay.co.uk/itm/NEW-SILENT-Brushless-Digital-SERVO-INDUSTRIAL-SEWING-MACHINE-MOTOR-0-3000-Rpm-/141155163283?pt=UK_CraftsCollect_SewingMachines_RL&hash=item20dd80dc93#shpCntId

No experience with that motor or that vendor, but that's the sort of
thing you want.  


--  
sig 58

Re: Further saga of the Bernina 950
I have just had a phone conversation with the owner of the firm that I  
purchased the machine from. He confirmed that the motor would be too big  
but talked me through checking the size of the pulley which according to  
him should be 60mm about 2 inches. So that it should be working in the  
right way for this machine.

I explained the birds nesting  and he couldn't come up with anything  
concrete. We talked about  the start up procedure which I am already  
doing. He mentioned a possible  over run free spinning of the bobbin as  
a potential reason for the bird nesting, but he's not sure on this model.

The service man is having a day off so I will call him tomorrow  to ask  
about that and to confirm the pulley size. We will see where we go from  
here.


--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950
Le 09/01/2014 10:33, Claire in France a écrit :
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Forgot to add, My pulley appears to be the right size 6.3 cms

--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

Re: Further saga of the Bernina 950



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The 6.3cm would put it at 2.5 inches just a hair smaller than the standard 3  
inch pulley. 1.5 inch would be the best option for a pulley but a servo  
motor would be better all around.

--  
Ron Anderson A1 Sewing Machine
18 Dingman Rd Sand Lake, NY 12153
We've slightly trimmed the long signature. Click to see the full one.
Re: Further saga of the Bernina 950
Le 09/01/2014 17:03, Ron Anderson a écrit :

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I am seriously considering it, I shall probably look at Ebay  as per  
David's suggestion, even if it's a UK one my father is in the UK at the  
end of the month and might be able to pick it up then.

--  
Claire in Montreal FRANCE
www.claireowenperso.free.fr

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