Setting up the HERCULES Fibre feed unit on the 1m Mclellan telescope at the Canterbury University Mt John Observatory

Mt John 1m Telescope

Starting position - In this case Alan has been the last observer and has removed his camera and the telescope is set with the F/8 mirror. So to use HERCULES we will need to change the secondary mirror to the F/13.5 mirror, remove the F/8 corrector lens and attach the correct light sheilds and change the counterweights

Mt John 1m Telescope

Lower the floor so you can get all of the required equipment

Mt John 1m Telescope

This is the Fibre Optic Cable used to transport the light from the telescope to the HERCULES spectrograph

Mt John 1m Telescope

Most of the time the equipment will be in the Aluminizing Room - we need the Secondary mirrors on the trolly hoist - HERCULES Fibre feed unit on its trolly and the long black tube (F/13.5 Light sheild)

Mt John 1m Telescope

Move the mirror trolly / hoist to the west side of the telescope pier with the hoist arm pointing North and move the HERCULES Fibre feed unit and black tube on to the floor (anywhere out of the way)

Mt John 1m Telescope

Raise the floor and turn on the DEC motor for the telescope

Mt John 1m Telescope

Open the mirror covers (bottom switch on aluminium plate)

Mt John 1m Telescope

Using the Hand controller move the telescope North at speed 5

Mt John 1m Telescope

When the telescope is pointing North very steeply the 10 Deg and 5 Deg red lights will come on and the motor will cut out - unless you push and hold down the LIMIT OVER RIDES (black and RED bottons) move the telescope to +46 10 00 in DEC

Mt John 1m Telescope

Move the Mirror trolly / hoist into position so its inline with the middle of the mirrors (east / west) and so the hoist arm or trolly wont hit the telescope or secondary mirror (north / south)

Mt John 1m Telescope

Raise the floor to maximum, take care not to hit anything - check that the white boxes, ladder, chairs etc are not going to hit the lights or other things on the wall

Mt John 1m Telescope

With the safety block in place (south side of dome) you can just push and hold the UP botton until it automatically stops

Mt John 1m Telescope

Position of trolley and telescope at this point

Mt John 1m Telescope

Looking at the top end of the telescope with the F/8 mirror in place

Mt John 1m Telescope

Take off the F/8 light shield using allan key - there are two bolts to loosen - just loosen the bolts there is no need to remove them

Mt John 1m Telescope

F/8 Secondary mirror with light shield removed

Mt John 1m Telescope

1m mirror and the light shield and corrector lens set

Mt John 1m Telescope

Remove the light shield on the corrector lens set - take the bolts out as there is not enough clearance to remove the corrector lens with them in place

Mt John 1m Telescope

Place the bolts from the light shield in this box, which is on the telescope control console

Mt John 1m Telescope

Light shield removed - showing 1m mirror and F/8 corrector lens

Mt John 1m Telescope

From the F/8 mirror box get the F/8 secondary mirror holder and place it around the F/8 mirror and connect the hook to the cable on the hoist - please take care not the touch the surface of the mirror

Mt John 1m Telescope

Wind the handle to tighten the cable and slightly lift the secondary mirror - just enough so it is holding all the weight on the mirror

Mt John 1m Telescope

Double check to see if the mirror holder is correctly attached and is supported by the hoist - if all is good then you can undo the secondary mirror connecting bolt and remove it

Mt John 1m Telescope

Secondary mirror connecting bold that holds the secondardy mirror on the top end of the telescope

Mt John 1m Telescope

remove the F/8 secondary mirror from the telescope - you may need to tap it to release it from the telescope holder

Mt John 1m Telescope

Move the mirror trolly / hoist back towards the bottom of the telescope (South) all the weight of the mirror should be held by the hoist - hold the mirror to stop it swinging - but there is no need to lift anything. Once there is enough space between the truss then lower the F/8 mirror into its box, there is a support inside the box make sure the mirror is sitting nicely in place

Mt John 1m Telescope

Top end of telescope without secondary mirror

Mt John 1m Telescope

F/8 mirror sitting in its box with the mirror holder left on, ready to be used next time

Mt John 1m Telescope

There is a dark brown mirror cover place this on the mirror to protect it and close the box

Mt John 1m Telescope

Looking at the top end of the 1m telescope - the entire top circle needs to be swung around 180 degrees so the F13.5 mirror holder is moved to the inside of the telescope (currently pointing out with the F/8 pointing inwards)

Mt John 1m Telescope

Looking at the top end of the telescope with F/8 connection pointing towards the primary mirror (inwards) - you can see that the F/8 side sticks out, this is important to consider as when you undo the top and bottom truss bolts the bottom side end will swing out with some force if you dont hold it - so be ready for this and smoothly rotate the top end around

Mt John 1m Telescope

Using allan keys inserted in the holes - remove the bottom and top truss bolts

Mt John 1m Telescope

bottom truss bolt removed

Mt John 1m Telescope

Undoing the top truss bolt - when you remove this bolt the top of the telescope ring will pull away from you (bottom side comes towards you) keep hold of this to stop it swinging

Mt John 1m Telescope

Top end of the telescope with no secondary mirror and with the top and bottom truss bolts removed

Mt John 1m Telescope

Rotate the top end around so the F/13.5 side is pointing inwards towards the primary mirror

Mt John 1m Telescope

Replace the top and bottom truss bolts using allan keys

Mt John 1m Telescope

Top end of the telescope with the F/13.5 side pointing inwards - you can see this is labelled (blue lable)

Mt John 1m Telescope

Lift the F/13.5 mirror on to the top of the F/8 mirror box - please take care when lifting and moving this into place

Mt John 1m Telescope

Remove the lid of the F/13.5 mirror box

Mt John 1m Telescope

Carefully attach the D-shakle to the F/13.5 mirror ring

Mt John 1m Telescope

With one hand holding the F/13.5 mirror lift the mirror out of the box by winding the hoist handle (with your other hand) - please take care not to touch the mirror surface

Mt John 1m Telescope

Once the mirror is high enough out of the box you can let the mirror go and let all the weight be supported by the hoist

Mt John 1m Telescope

While supporting the mirror move the hoist trolly back (north) and with the mirror pointing inwards align the mirror to the mirror holder on the top end of the telescope

Mt John 1m Telescope

There is a small key cut out - this needs to align for the mirror to be put correctly inplace - this ensures the secondary mirror is always on the same rotation in relation to the rest of the telescope

Mt John 1m Telescope

Replace the telescope secondary mirror holding bolt

Mt John 1m Telescope

Double check that the secondardy mirror is held in place - if so then you can take the hoist cable off

Mt John 1m Telescope

Place the light shield in place - make sure the blue lines are in line

Mt John 1m Telescope

tighen the screews to hold the light shield in place - there are 3 of them

Mt John 1m Telescope

Top end of the telescope with the F/13.5 mirror and light shield inplace

Mt John 1m Telescope

Move to the counter weight side of the telescope - there will be adjustments to make here that can only be made while the telescope is titlted over

Mt John 1m Telescope

There is a clearfile book on the telescope control console that has all the required settings - please carefully follow the instructions there - this is important so the telescope has the correct balance

In this photo I am removing the North side 10lb swing arm weights

Mt John 1m Telescope

North side swing arm weights removed from both the swing arms

Mt John 1m Telescope

I have moved the North side assemetry weight (Green box) from 3/4 to 0

Mt John 1m Telescope

Rotate the handle to the correct RA (Right Ascension) balance - the RA balance measure rod is kept on the top back of the telescope pier

Mt John 1m Telescope

RA balance moved to the correct position for the HERCULES fibre feed unit - for each piece of equipment there will be a slightly different setting required

Mt John 1m Telescope

Undo the swing arm weights

Mt John 1m Telescope

Please keep hold of the swing arms while you are undoing them as they may pull away from you and crash into each other

Mt John 1m Telescope

Move the swing arms into correct position and redo them - make sure the locking bolts go into the holes correctly

Mt John 1m Telescope

Swing arm and other weights in the correct position for the HERCULES fibre feed unit

Mt John 1m Telescope

Back end of the telescope - need to remove all the weights and Camera / eyepeice attachemnt plate

Mt John 1m Telescope

Removing the weights

Mt John 1m Telescope

Back end of the 1m telescope with the weights and camera / eyepeice plate removed

Mt John 1m Telescope

lower the floor, making sure that the mirror trolly / hoist is not going to catch on anything

Mt John 1m Telescope

With the floor just low enough for you to push and hold the OVER RIDE buttons - move the telescope SOUTH (max speed is 4 while the red over limit lights are on) until you get to -43 10 00 in DEC

Mt John 1m Telescope

With the telescope pointing upwards - remove the North, South East, and South West corrector lens bolts

Mt John 1m Telescope

Move the corrector lens trolly into place and raise the floor until it is all most touching (plase leave a gap thou)

Mt John 1m Telescope

make final adjustment of the corrector lens trolly and use the bottle jack to lift the top of the trolly into position so it is taking all the weight of the corrector lens

Mt John 1m Telescope

Remove the other two bolts to release the corrector lens from the telescope

Mt John 1m Telescope

There are 5 bolts holding the corrector lens in place these are removed using the allan key

Mt John 1m Telescope

lower the bottle jack making sure the corrector lens is being lowered and safely in position on the jack

Mt John 1m Telescope

Once the jack has been lowered use the hand controller to lower the floor at slow speed - making sure the corrector lens is freely coming out of the telescope

Mt John 1m Telescope

Corrector lens has now been removed from the telescope - move it carefully out of the way - making sure that the trolly dosent tip

Mt John 1m Telescope

Back end of the telescope with everything removed

Mt John 1m Telescope

1/2 relpace the North and South bolts so you can place the F/13.5 light shield into place

Mt John 1m Telescope

Carefully lift the black tube (light shield) into place and replace the remaining bolts

Mt John 1m Telescope

To attach the HERCULES fibre feed unit and power supplies on the back of the telescope you will need 4 short bolts and 6 long bolts (long bolts are for the HERCULES fibre feed unit)

Mt John 1m Telescope

Reomve the dust cap off the HERCULES fibre feed unit

Mt John 1m Telescope

Position the HERCULES fibre feed unit under the telescope

Mt John 1m Telescope

raise the floor (Slowly) until it is almost touching the back of the telescope

Mt John 1m Telescope

Align the HERCULES fibre feed unit and place the long bolts into the correct holes only finger tight

Mt John 1m Telescope

Use the trolly jack to lift the HERCULES fibre feed unit up so it is touching the back of the telescope - dont use to much pressure it only needs to be touching

Mt John 1m Telescope

Tighten the 6 long bolts to hold the HERCULES fibre feed unit in place

Mt John 1m Telescope

Lower the trolly top

Mt John 1m Telescope

Now all the weight of the HERCULES fibre feed unit is being held by the telescope

Mt John 1m Telescope

Place two of the short bolts on the east and west side of the trolly ready for you to lift and put the bolts in place for the power supplies

Mt John 1m Telescope

Lift by hand and put the bolts in place for the Thorium lamp power supply

Mt John 1m Telescope

Once both bolts are in place do these up tightly

Mt John 1m Telescope

Place the HERCULES fibre feed power unit in place and tighten the bolts

Mt John 1m Telescope

Telescope with HERCULES fibre feed unit and power supplies in place - move a chair into the centre

Mt John 1m Telescope Mt John 1m Telescope

There are two cables that run from the HERCULES fibre unit to the telescope pier - one is for the auto guider and the other is for the computer in the control room to comunicate with the HERCULES fibre feed unit (turntable position and turn on and off calibration lamps)

Mt John 1m Telescope

Take some of the slack out of the cable using the cable holder

Mt John 1m Telescope

Connect the power supply cables between the power supplies and the multi board also plug in the auto guider power

Mt John 1m Telescope

HERCULES fibre feed trolly removed

Mt John 1m Telescope

On the bottom side of the HERCULES fibre feed unit - remove the fibre optic cable cover, this pulls off

Mt John 1m Telescope

The fibre optic cables are in a block this block can only go into the fibre feed unit one way (with numbers on the south side)

Mt John 1m Telescope

Tigten the bolts holding the fibre cables to the fibre cable selector plate with an allan key

Mt John 1m Telescope

Fibre cable held in position and with number 1 cable aligned

Mt John 1m Telescope

Number one is selected on the out side of the fibre feed unit

Mt John 1m Telescope

Replace the fibre cable cover and put the cable holder inplace

Mt John 1m Telescope

Cable holder inplace - the fibre cable should be held securily but also be able to move from positions 1-4 without any problems

Mt John 1m Telescope

Attach the safety cable

Mt John 1m Telescope

Move the mirror trolly to the South side of the dome making sure you dont run over any cables or hit the telescope on the way

Mt John 1m Telescope

HERCULES trolly and mirror trolly on the South side of the dome

Mt John 1m Telescope

When almost dark turn the Thorium lamp on and up to 7.5mA

Mt John 1m Telescope

In the control room turn the turntable to "Beam splitter" and move the telescope to a known bright star - find that bright star (usually from F/8 to F13.5 secondary mirrors) there is about a 6 minute adjustment which needs to be made (usually this is North)

Mt John 1m Telescope

Once you have found the correct star centre it on the screen and start a manual exposure - watch how many counts are coming in per second while slowly moving the telescope up/down left/right until you find a sweet spot of high counts coming in

Mt John 1m Telescope

Once you have found the correct position for the light of the star to be going into the HERCULES fibre cable - enter the cordinates from the red RA / DEC display on the wall into the RA and DEC precessed boxes

Mt John 1m Telescope

Then on the top left side of the screen push the Co-ordinate Correction tab

Mt John 1m Telescope

This will bring up the Co-ordinate Correction Box - Push the "Correct the Co-ordinates" button. From then on you should be able to use the Goto selection box to just select the star you want and for it to land on screen

(HERCULES) High Efficiency and Resolution Canterbury University Large Echelle Spectrograph
  http://www.phys.canterbury.ac.nz/research/astronomy/hercules/  


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