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====== Straight Stitch (DRAFT) ======


  * Model: [[https://juki.com/ddl-8700|Juki DDL 8700]]
  * Manufacturer: [[https://juki.com|Juki]]
  * Manual: [[https://juki.com/pub/media/wysiwyg/products/DDL-8700_manual.pdf|PDF]]

This machine is great for working with long straight items like draperies and bedding using fabric ranging from light to medium weight.

Maximum sewing speed is 5500 stitches per minute!

The [[#tool-safety|Tool Safety]], [[#tool-care|Tool Care]], [[#operation|Operation]], section of this guide are what instructors use to ensure that you can use the equipment according to community expectations.

====== Requirements ======

[[https://www.protohaven.org|Industrial Sewing Machine]] clearance or class equivalent is required before use.

====== Warnings ======

🚫 Do not push or pull material while stitching.\\
⚠️ Power off the machine before threading, inserting the bobbin, or handling the needle.\\
⚠️ Keep hair, loose clothing, and fingers away from all moving parts!\\

See the [[#tool-safety|Safety Section]] for more information.

===== Tool Anatomy =====

==== GENERAL LAYOUT ====

{{tools:industrial_straight_stitch_tool_tutorial_image11.jpg}}
  - Light - For easy viewing
  - Straight Stitch - The Machine
  - Thread Holders  - Please Note: The secondary holder is for continual bobbin winding
  - Bobbin Winder
  - Maintenance Tag - Manually tracks the usability status with Green/Yellow/Red cards
  - Knee Presser Foot Lifter - Knee operated lever that lifts the presser foot while sewing
  - On/Off Switch - Main power to the machine
  - Foot Pedal - Controls the speed of the motor

==== MACHINE ANATOMY ====

{{tools:industrial_straight_stitch_tool_tutorial_image5.jpg}}

  - Manual Presser Foot Lifter (not seen, around back)
  - Presser Foot Height Adjustment
  - Thread Guide
  - Oil Level Indicator 
  - Hand Wheel
  - Thread Tension and Guides
  - Stitch Length Knob
  - Bobbin Winder Tensioner
  - Needle 
  - Reverse Lever 
  - Bobbin Winder Spindle

===== Tool Safety =====
=== Personal Protective Equipment ===

  * Safety glasses are recommended.

Check the needle condition prior to sewing, be sure it is the correct size for the material being sewn, and it is not bent or chipped. 

Never sew over pins, staples or other metal materials, as this may cause the needle to shatter, resulting in bodily harm and severe machine damage. 

Always turn the handwheel towards you, (down) never away.


==== COMMON HAZARDS ====

The most common hazards are thread jams and broken needles. Watch for binds, jams, and bird nests—stop immediately if they occur.

  * Ensure the needle and thread are removed before winding a bobbin
  * Avoid pulling/pushing fabric, which may misalign and break the needle 

The most significant hazard is injury. Always power off and run the machine until the motor drains before handling, adjusting, or threading.

  * Keep fingers 3” away from the needle 
  * Power off and drain the motor before:
    * Threading
    * Replacing needles
    * Removing jams

  * Tie back hair and scarves 
  * Tuck sleeves behind elbows 

==== Prohibited Materials ====

Thread Jams and needle breakage are critical concerns. Material that is too thick or rigid will lead to needle breakage. Material that is too slick (plasticized or otherwise “finished”) will slide against the presser foot and cause thread jams and/or needle breakage.

Industrial machines will not “step over” pins in the fabric. Hitting one may break the needle and send broken parts into the hook below.

For those reasons, it is important to avoid:

  * Abrasives
  * Paper and cardboard products
  * Pins in the fabric
  * Plastics
  * Rigid Material (non-fabric)


===== Initial Setup =====

  - Wipe down the machine and bed to clean up any oil or dust.
  - Check the oil level, see Maintenance.
  - Power on the machine.
  - Wind the bobbin.
  - Power off the machine to insert the bobbin and thread the machine.
  - Thread the machine.
  - Ensure the needle is usable and appropriate for the material and thread.
  - Lower the presser foot and begin operation.


==== CONSUMABLES ====

Appropriate needles and bobbins are available in the consumables section of our store front. Both are sold individually for ease and convenience.


Members are responsible for bringing their own thread and fabric.


  * **Bobbin:** Juki #229-32909 metal bobbin\\

  * **Thread:**
   * Must be in a Cone or Vicone to accommodate the high speed
   * Always use the same thread in the upper tension and in the bobbin

  * **Fabric** Light to medium weight

  * **Needle**:
   * [[https://www.thethreadexchange.com/miva/merchant.mvc?Screen=CTGY&Category_Code=needle-information|Size Range for machine:]]
    * DBx1 #9 to #18 (Organ)
    * 134 #65 to #110 (Groz-Beckert)
  * Point Type: [[https://sewtootpatterns.com/wp-content/uploads/2016/02/Needle_Types.jpg|appropriate to fabric]]
  * Weight: [[https://sewtootpatterns.com/wp-content/uploads/2016/02/Needle_Types.jpg|appropriate to the thread and fabric]]
  * Eye: must be 40% larger than the thickness of the thread

====  ====

==== CHECKING NEEDLE SIZE ====

  - Grab a needle and about 12 inches of the intended thread
  - Thread the needle
  - Hold both ends of the thread, creating a 60 degree slope with one end to see if the needle is able to slide along the slope
  - Reverse the process to see if the needle slides back


If the needle does not freely slide down the thread, the size may be too small. As a general rule, you’ll want the smallest size needle that will slide freely down the thread.

==== WIND THE BOBBIN ====

====  ====

  - Raise the presser foot by winding the handwheel (a) counterclockwise
  - Ensure there is nothing near the needle while filling the bobbin 

**It does not disengage while winding like a consumer machine**

  - Pass the thread through the guide on the tension and between the disks (b).
  - Pass the thread between a hole on the bobbin case (c).
  - Rotate the case 2-3 times to manually wind the thread for traction.
  - Place the bobbin on the spindle, holding onto the tail of loose thread.
  - Gently press the foot pedal to wind the bobbin. It will stop when full.


Please watch [[https://www.youtube.com/watch?v=22AeAlLLEgM|this video,]] which includes details of winding and placing the bobbin in the case.


==== ATTACH THE BOBBIN CASE ====



|{{tools:industrial_straight_stitch_tool_tutorial_image4.png}}|- Pass the thread through thread slit A, and pull the thread in direction B. By doing so, the thread will pass under the tension spring and come out from notch B.\\ \\ \\ \\ Check that the bobbin rotates in the direction of the arrow when thread C is pulled.|

 

==== INSERT THE NEEDLE ====


|{{tools:industrial_straight_stitch_tool_tutorial_image9.png}}|Turn the handwheel forward until the needle bar is at the highest position\\ \\ - Loosen the needle clamp screw and hold the needle so that the scarf is to the right and the long groove in the needle is exactly to the left.\\ - Insert the needle (1) into the clamp hole until it will go no further.\\ - Tighten the needle clamp screw firmly (monkey tight—not gorrilla!)|



==== THREAD THE MACHINE ====

[[https://www.youtube.com/watch/v=QI-8pLZGqvU|Example Video]] 


{{tools:industrial_straight_stitch_tool_tutorial_image3.png}}

Thread the machine following the order of (1) through (11) as shown above.

Move the handwheel towards you, never away to get the top thread to take up the bobbin thread.


===== Operation =====

  -  Setup the machine
  -  Raise the presser foot with the knee pedal to load fabric
  -  Test by sewing on scrap similar to what you will be sewing
  -  Adjust the tension and stitch length
  -  Remove test and trim threads
  -  Load and align project fabric
  -  Back stitch/reverse to keep your stitch from unraveling
  -  Sew
  -  Cleanup

==== ADJUST THE TENSION ====

{{tools:industrial_straight_stitch_tool_tutorial_image7.png}}

====   (1) Adjusting the needle thread tension ====

  - Direction A clockwise - to increase needle thread tension.
  - Direction B counterclockwise - to decrease needle thread tension.\\

==== (2) Adjusting the bobbin thread tension ====

  * Turn tension adjustment screw 2 clockwise (in direction C), to increase bobbin thread tension.
  * Turn tension adjustment screw 2 counterclockwise (in direction D), to decrease bobbin thread tension.

|{{tools:industrial_straight_stitch_tool_tutorial_image2.jpg}}|{{tools:industrial_straight_stitch_tool_tutorial_image8.jpg}}                                                                                                                                      |
| Normal tension     | Too loose. Turn the dial clockwise to increase tension.                                                                                                  |
|{{tools:industrial_straight_stitch_tool_tutorial_image6.jpg}}|\\ Too tight. Turn the tension nut counter clockwise to reduce the tension.|



==== BACKSTITCH & STITCH SIZE ====


|{{tools:industrial_straight_stitch_tool_tutorial_image1.png?300}}|Turn the dial to change stitch size\\ \\ \\ \\ Press the lever to reverse at the end of the seam|

===== Cleanup =====
Power off  and drain the machine
Unthread machine head and spool
Remove bobbin
Wipe down, vacuum, and blow out lint and stray clippings
Sweep up threads, lint, and debris and deposit in waste bins
Return checkout kit


==== MAINTENANCE REQUESTS ====
  - Update the physical Maintenance Tag at the machine
    * 🟢Green can be used without issue
    * 🟡Yellow can be used withcaution
    * ⛔Red cannot be used without hazard to either the user or the equipment

 - Record issues at [[https://www.protohaven.org/maintenance|protohaven.org/maintenance]]. This notifies our staff and volunteer maintenance crew of any issues.


==== Troubleshooting ====

^**Common Issues** ^**Possible Causes** ^**Resolutions**^                                                                                         
| Thread comes out of the needle on the first few stitches| The threads need a longer tail, and needs to be held back, or\\ \\ The take up lever is not at its highest position| Pull threads to the back when beginning the seam, with the take-up lever in it’s highest position|
| Thread clumps up and fabric won’t feed through| Bent needle, needle inserted incorrectly, machine threaded incorrectly| Be sure it is threaded left to right.  \\ \\ Be sure the needle is right for the fabric.|                    
| Skipped stitches| Bent needle, needle inserted incorrectly, machine threaded incorrectly                                             | Turn off the machine be sure there is no jam near the hook and bobbin casing, then re-thread the machine and bobbin |



===== Special Setups =====

For all of the following, please make a Special Setup Arrangement with a Protohaven Staff Member to gain clearance in advance of use. Consider whether you need specialty adjustments as part of an extended project, or if the adjustments or accessories are temporary. 


==== WINDING THE BOBBIN WHILE SEWING ====

For large projects, a second bobbin can be wound while sewing. 

  - A second spool of thread is required. 
  - The needle and presser foot remain in place, and sewing can continue. 
  - Follow all other instructions in “Bobbin Winding” above

==== ADJUSTING THE THREAD TAKE UP STROKE ====

The amount of thread pulled from the spool can be adjusted to allow thicker or thinner materials to sew more precisely. All adjustments must be reverted to the average settings when finished.

==== SPECIALIZED PRESSER FOOT ====

Cording foot, Left/Right piping, Zipper foot, Hemmer - User is responsible for purchasing


==== SPECIALIZED FEED DOGS ====

The machine is set for average types of fabric, but can be adjusted for very fine fabric or very thick. The feed dogs can be changed out for various weights, but the user is responsible for purchasing these and re-setting the machine completely after use. 


===== Additional Resources =====

[[https://www.youtube.com/watch?v=QI-8pLZGqvU|Threading and overview ]] 

[[https://www.youtube.com/watch?v=AZsHSBN2Q6c|Machine capabilities]]

[[https://www.youtube.com/channel/UC9DPdV59J32ftSwG2boGYlQ|Sewing Gold Channel]] : (multiple industrial machine videos)



==== SUPPLIES ====

[[https://www.wawak.com/&sa=D&source=editors&ust=1676742700829073&usg=AOvVaw0Wbizk4Rt_RA_6rTqfU1Yz|Wawak]] —Place to buy Needles and thread of every type, including heavy duty and embroidery


[[https://www.thethreadexchange.com/miva/merchant.mvc?Screen%3DCTGY%26Category_Code%3DNDL-135x17&sa=D&source=editors&ust=1676742700829607&usg=AOvVaw1NJYXAnTLKLF6x3clQRm-e|The Thread Exchange]] - thread and needles


[[https://www.thethreadexchange.com/miva/merchant.mvc?Store_Code%3DTTE%26Screen%3DCTGY%26Category_Code%3Dneedle-information&sa=D&source=editors&ust=1676742700830475&usg=AOvVaw2ol_2TNOsxxeNjsPj78DbT|Needle buying Guide]]


[[https://www.servicethread.com/blog/industrial-sewing-thread-needle-sizes&sa=D&source=editors&ust=1676742700831159&usg=AOvVaw09QuL5MFPN91oV-4xO7zUQ|Needle and thread Guide]]


[[https://www.thethreadexchange.com/miva/merchant.mvc?Screen%3DCTGY%26Store_Code%3DTTE%26Category_Code%3Dprewound-bobbin-information&sa=D&source=editors&ust=1676742700831661&usg=AOvVaw3faMV7GkKnMUpG0idGiCqJ|Bobbin Guide]]

====== Staff Use ======

|⚠️ AUTHORIZED MAINTENANCE GROUP ONLY|

If you are part of the maintenance group please log on to the #maintenance channel of our Discord server to:


  * Perform a Maintenance Action
  * Request a Maintenance Purchase
  * Review complete Maintenance Logs for each machine
  * Generally chit-chat about maintenance


===  ===

===== Tools =====

The following should be in a Maintenance tool kit for the....


  * item1
  * item2


===== Regular Maintenance =====