two point coiling

8/11/2019 Two Point Coiling

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Nothing in making springs is set

in stone.

Nothing I can think of has an

unbreakable rule that it MUST be

done a certain way.


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BASIC TERMS


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Tool Function

! Cutter movable part of

cutting system

! Arbor fixed part of cutting

system! Upper coiling point

controls OD and initial

tension

! Lower coiling point centers

OD over the arbor

! Wire guide holds the wire

for the coiling process


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All tooling is the right size

Installed correctly on the machine.


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Wire into the machine and up to the coiling points.


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! Set the cutter to straight cut

! Adjust to arbor and cutter to cut the part off.


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Confirm coiling point setup

Spring center

Contact the wire in the

center line of coiling

point.


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Coiling point adjustments

Lower coiling point

should be in line with

wire.


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Loosen both screws of the

coiling point holders, then

feed some wire to let thecoiling points rotate to the

wire.


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Get the spring to coil

Use the cutter and arbor to cut the part off

If you are using the rotating cut cutter and arbor, do not worry

about the burr at this time


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! Get the part to coil and get the correct dia. ( just a little smaller than you really want )

! Correct initial tension for the spring you are making.

! You may have to remove the arbor, and or coiling points and do some modifications

to them in order to get all of this setup properly. ( This is normal! )

! Adjust in/out of the coiling point to get the desired initial tension.

Adjust the two coilingpointsin andout to get the desired initial tension.

Measure the outside diameter of

the spring.


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At this point you should be able to coil the spring without it

catching any place on the machine

The diameter should be correct

You should have the amount of tension that you want. If youdo not have ALL of these things do NOT go any further!

Check the initialtension on the coiled spring. If this amount isnot proper for the spring, please try to adjust the coiling points

by above step.


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Computer part Press the Q button to set the minimum OD.

Measure the part that you have coming off of the machine.

Enter OD reading in millimeters into the minimum OD section.


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Enter the wire diameter in millimeters.


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Go to the OD origin section input the correct ODfor your spring


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Coil approx.3/4 of a coil

Bring the pitch tool up ( very close but not touching )

Record value in pitch tool section of the screen


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A basic compression spring has

five basic parts.

Dead coil ( closed coil ) Transition from dead coil to body

Body

Second transition Last dead coil


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Dead coil ( closed coil )

Transition from dead coil to body

Body

Second transition

Last dead coil

The 5 parts of a compression spring


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Setup program with these five sections

The dead coil should be approx. !coil

Transition should be approx. "coil

Body is approx. the active coil count

Second transition is also approx. "coil

Last dead coil is approx. !also


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a. the dead coil should be approx. !coilb. transition should be approx. "coil

c. body is approx. the active coil count

d. second transition is also approx. "coil

e. last dead coil is approx. !also


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Check to see if the part is square

( both ends )


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Work on the front end first

Adjust feed in the N command firstend

Going up, then add wire

Going down, subtract wire Keep this within + - .25 coils of the .75coils you started with

The ends not being square is not a

product of the machine speed, it hasto do with the amount of wire in thetransition. ( pitch to feed ratio )


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Transition is kicked up


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Transition laid down


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If you can NOT get the end square, do the following.

Pitch tool origin is 8.00 and you have a pitch movement from

the trail of 14.00.

Insert pitch value of 11.00 ( center of 8.00 and 14.00 )

Press INS key to create a new step between step2 and step3. The original step3 will move down tostep4.


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MOVE N .38 PT 11.00

MOVE N .38 PT 14.00

!of the .75 value is .38 PT 10.0 = 14.0 ( body pitch ) + 8.0 ( origin ) / 2

11.0 is in the middle of these two values.


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Adjust the feed on both steps

Adjust the pitch value on 003.

DO NOT ADJUST THE PITCH ON 004 TO ADJUST THE

SQUARNESS ( PITCH FOR THE BODY )


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Do the same for the squareness of the last end. ( 2nd transition )

Difference is you will send the PT back to the PT origin.


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Both ends square

The machine should be running at rate

All the tooling should be set Arbor should be in the proper location etc.

Correct number of coils ( proper number of

coils + - 1/4 of a coil )

At this point you should have the following


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setup the cutting system

Fig-AFig-BFig-C


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Measure the end coils to the body

Input the OD command in the program

The OD command will go in the TRANSITIONsection, not the body feed!

Add OD command to the step3when it starts to coil the spring with pitch.Add OD command to the step3when it starts to coil the spring with pitch.


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Required OD of 25mm, ( the OD origin is

25.0mm )

Body measures 24.5mm

OD command of approx. 25.5mm

Back end of spring ( the last transition )

OD back to the origin.( back to 25.0mm )

If you have two sections, you will need

two OD commands!


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If you have two sections for the transition like

below, then you will need two OD commands.

The OD command will go on the same line as thepitch.

Add OD command to the step3when it starts to coil the spring with pitch.


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Final Adjustments

Check numbers of coils

Check free length

Check OD of spring Check running speed

Check that all adjustment bolts are tight

Set counter Start production

two point coiling

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