Question about Motic Upright Compound Microscope Model Ba310

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Tension knob the tension knob is loose and pulled out from the scope. I cant bring the stage up

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Directions singer touch & sew zig zag model 638


I'll try to describe the threading procedure but a picture is worth a thousand words. You work the thread from right to left with the needle up. Put the spool of thread on the spindle at the top and place the spool holder on with it oriented to have side that is closest to the size of the spool closest to the spool. Pull the thread through the hole in the "peg" on top of the machine. Then bring the thread down to the "bell" and up under the catch and over to the other side of the bell. Next bring the thread down through the guide to the tension knob. Bring the thread up on the left side of the tension knob and lift the spring loop until the thread catches on the lips. Pull the thread through the guide that you used coming down from the spool and bring the thread through the hole on the guide at the top of the needle bar. Bring the thread down through the guide that is even with the tension knob. Then pull the thread slightly from right to left so that it enters the notch on the guide just above the needle. Then push the thread through the needle from front to back (or use the needle threader).

Singer has the manual available for download here: http://www.singerco.com/uploads/download/aa0c55f35d4cd136957871417b8e66e112b2015d.pdf . See page 6 (page 8 of the PDF) for a picture of threading the needle.

I hope this helps.

Cindy Wells

Mar 29, 2014 | Google Finance

1 Answer

Singer 2517c -I need Threading instructions please. Also the top thread is loose -how do I fix that


Lift the needle to the highest point by turning the handwheel. Lift the pressure foot to release the tension on the system. Place the spool on the spool pin and put the spool cap on to hold the spool firmly.

Next bring the thread to the thread guide and snap it into the guide. Then slide the thread under the guide and through the slot (use one hand). Next lead the thread down on the right of the tension knob and up on the left. This puts the thread in the tension discs. Next slip the thread into the take up lever. (Bring the thread to the top of the lever and back towards the machine. Then slide the thread into the slot on the take up lever and then back towards you.

Next lead the thread through the next pair of guides. One is on the machine below the take up lever; the other is attached to the needle holder.

Finally thread the needles from front to back.

First check if there is a slight drag on the upper thread when you pull it through the machine (pulling it under the foot of the machine). Move the tension knob to the right to increase the tension. When you stitch a test piece, your top thread is visible on the bottom of your sewing thread, rotate the tension knob to the right by half a turn (get the dot closer to a higher number).

If there is no change in the tension as you turn the knob, take the machine for service. The springs in the tension system may need to be replaced.

The manual is available from Singer here: http://www.singerco.com/accessories/manuals.html . Enter only the 2517 model (leave off the c). A pdf is available for free; there is also an option to order a hard copy. A picture of the threading route is on page 28 of the pdf (page 26 as the manual is numbered).

I hope this helps.

Cindy Wells

May 12, 2011 | Singer 2517 Mechanical Sewing Machine

1 Answer

The stage slides down on its own and the view gets out of focus.


Just inside the coarse focus knob you will see a "chrome" ring with holes it it. That ring needs to be tightened just a bit. It will make the coarse focus knob stiffer so tighten only enough to stop the downward drift of the stage. A funny looking tool should have come with the scope. It is used to adjust this "tension" ring.

Oct 22, 2010 | Swift M2251C Monocular Microscope

1 Answer

The focus knobs drift


Just inside the coarse focus knob you will see a "chrome" ring with holes it it. That ring needs to be tightened just a bit. It will make the coarse focus knob stiffer so tighten only enough to stop the downward drift of the stage. A funny looking tool should have come with the scope. It is used to adjust this "tension" ring.

Oct 13, 2010 | National Optical 138-MS Monocular...

1 Answer

How do i fix the tension? i've been playing with the knobs for hours, but the threads are still too loose on the fabric.


Try decreasing your stitch width and this should help. Put your tension dials on 4. Also make sure when you thread your machine your presser foot lever is up to allow you to get your threads through your tension discs properly. To test the tension (usually set at 4 on all 4 knobs) when you thread around the knobs pull the thread on both ends like you're using dental floss around the discs under the knobs so you can feel the pull (tension) on the thread. Let me know if this works for you.

Aug 22, 2010 | Juki MO-654DE Mechanical Sewing Machine

1 Answer

Stage slides down after focusing


There is a tension adjustment for this. It is located on the coarse focus knob which is on the same side as the switch. It looks like a chrome ring with about 3 holes in it. A strange looking tool should have come with the scope. It is designed to fit into these holes and allow you to adjust the tension on the coarse focus knob. You need to tighten it just a little bit. Not too much or you will have trouble operating the coarse focus knobs smoothly.

Jul 08, 2010 | Swift M2251C Monocular Microscope

1 Answer

Swift microscope no 634008 having problem staying in focus when switching magnification


First, a scope of this grade will not be completely in focus as you move from one magnification to the next. But it should be close enough that you do not loose your point of interest.
Be sure you are not pressing down on the stage specimen platform as you change magnifications. It is very sensitive to pressure. Also, be sure that the coarse focus tension is tight enough that the platform is not drifting down imperceptibly as switch magnifications. Look through the scope and watch if the image goes out of focus while you are watching it. If so, you have what is called "stage drift". This is corrected by tightening the tension on the coarse focus knob.
The tension adjustment is on the coase focus shaft. It looks like a chrome ring with about 3 holes in it. There should have been a strange looking tool that came with your scope. It is used to adjust the tension. If your specimen is "drifting" out of focus, simply tighten the tension ring a little bit at a time until the specimen no longer goes out of focus. Do not get it so tight that it is not easy to operate the coarse focus knob.

May 22, 2010 | Swift M2251C Monocular Microscope

1 Answer

How do I fix a mechanical stage from ''drifting'' downwards? Won't stay in position.I move the stage up into position under the objectives but as soon as I let go of the knob the stage drifts right back...


You need to tighten the coarse adjustment so it generates enough friction to keep the stage in place. How to tighten it will vary from scope to scope, but most just have the screws on the knob (metal circle inside the knob with two holes in it). To adjust this type, you'll need a special key wrench.

Feb 03, 2010 | Science & Laboratory

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