坦克风格时钟

Note the jump from 12 o'clock to 1 o'clock.

The hours are simply read off the hour ring as it passes the 24th Lancers badge. The hour ring revolves with the tank body and increments once an hour.

The minutes are read off the tank turret/gun barrel. The turret increments once a minute.

The time indicated below is 1:04.

The clock uses a 1:35 scale Early Production Sherman Tank Model from Tamiya.

There are many Sherman Tank versions and after studying actual WW2 images and videos of the 24th Lancers at that time I chose this model as it contained various Sherman Tank versions in the kit.

I have attempted to base it on a 24th Lancer C Squadron Tank as my Gt Uncle Cyril Brindley was in C Squadron.

Below-24th Lancers C squadron markings on the completed model.

From videos of the C Squadron tanks being entrained the Markings were higher up on the front of the tanks above the wooden load board.

In this position the markings would have been hidden behind the jerry cans of water & other bits and pieces carreid on the tanks.

Tanks would often be named for example C squadron with a name beginning with C ( the 24th Lancers used this convention.

I have used poetic license and named my tank after Cyril Brindley after my Gt. Uncle.

From the video the Tank serial numbers were on the side of the tanks. I have used an actual C Squadron serial number from the video.

Setup

Before use set the following in code.

timezone line 117

Wifi SSID line 127

Wifi password line 128

The clock is very simple to use with minimum intervention from the user.

On power up the clock will aquire time from the internet.

Once the time has been obtained the clock will auto set to the home positions- 1 hour and 0 seconds.

On pressing "Start Clock" the clock turns the tank body and turret to indicate the exact time.

Time is now updated every 1 minute indicated by the turret with the tank body moving every hour to indicate the hours.

Chimes are set as required on 24/7, daytime only or off.

In summer the "DST On" button is pressed followed by the "Start Clock" button to advance the clock by an hour.

In winter the "DST On" button is released followed by pressing "Start Clock" to retard the clock 1 hour.

The control panel has 8 switches 3 locking and 5 non locking as well as 5 panel mount LEDs.

Switches Latching

Chime On - When on chimes are enabled.

Chime 24/7- when on and Chime On is also on allows the chimes to sound 24/7.

Chime 24/7- when off and Chime On is also on allows the chimes to sound only during the preset times in the Arduino code.

DST On- When activated the clock will show DST (summer timw) & when off the clock will dsiplay winter time.

Note press "Start Clock" to set the clock to the new time.

Switches Non- Latching

Chime Vol + Increases the chime volume to max of 30.

Chime Vol - decreases the chime volume down to 0.

Start Clock after power on and the clock has stopped at the home location 1h 0m pressing this button sets the clock to the correct time.

Reset Clock Pressing this button resets the clock.

Step Hour this button rotates the hour hand by 1 hour and is used for setting up the clock.

LED Indicators

End Stop Hours this LED lights when the Hour endstop sensor is activated.

Note End Stop Hours LED will flash(and the clock is stopped) if the end stop is not reached in a preset number of steps.

WIFI Seach This LED flashes while the clock searches and logs into a WIFI Network.

WIFI OK This LED illuminates when WIFI is succesfully logged in.

WIFI FAIL This LED illuminates while there is no succesful WIFI login,

End Stop Minutes this LED lights when the Minute endstop sensor is activated.

Note End Stop Minutes LED will flash(and the clock is stopped) if the end stop is not reached in a preset number of steps.

Apart from the Oak base & the Perspex Dome the clock is 3D printed.

The clock turntable and drive gear were downloaded from https://www.printables.com/model/127726

The instructable is here https://www.instructables.com/3D-Printable-Timelapse3D-Scanning-Turntable/?utm_source=YT

See the Clocks web page here for full parts details http://www.brettoliver.org.uk/Sherman_Tank_Clock/sherman_tank_clock.htm#3dparts

Image below shows the Clock with spindle connector attached to the minute stepper spindle.

If use a M2 bolt in the lower hole to fix in place.

A large hole is drilled in the base of the tank hull so the spindle connector can pass through.

Remove the engine hatch from the model to access the spindle connector

With the turret removed place the tank body onto the turntable and position it as required.

I position it so the front of the tank is between 1o'clock and 12'oclock.

Replace the turret on the tank so the spigot on the turret fits into the spindle connector and tighten the M2 bolt on the spidle connctor to lock it in place.

With the clock powered on wait until the turret stops turning and the "End Stop Min" indicator is lit.

Losen the M2 bolt so the turret is free to rotate without moving the stepper motor.

Move the turret to the 0 minute position and tighten the bolt.

Reset the clock and check the turret points to the 0 minute when the endstop is reached.

Replace the engine hatch and press the "Start Clock" button and the clock will now tell the time.

Place the completed base and control panel on your chosen piece of timber.

Draw around the base leaving whatever overlap is required.

Cut out the base with a jigsaw.

Using a router add a bevelled edge

Paint or varnish the timber base as required then fix all the clock parts to the base.

Stepper Motors & Turntable in place

Tank in place

Turntable and Clock Construction

The steppers motors, electronics and 3D parts of the clock internal are shown below..

All the parts are built off the 3D printed "base11" shown below flipped upside down.

Bottom view of Base11

Mount the 3 off "bearingmountcenter" on the three legs as shown below.

Loosely fix in position with 6 off M3 Bolts, 12 off M3 Washers and 6 off Nyloc nuts.

Glue center 22mm x 7mm x 7mm bearing in place flush with the rear of the round plate not the square stepper motor plate so it sits out from the other side of the plate a few mm.

Insert the 3 black printer bearings onto the 3 "bearingmountcenter" and secure with M2 self tappers and M2 washers.

Below bearing fitted flush to base not the sqaure stepper mount.

Black 3D printer bearing and 22x7x7mm center bearing.

Fix the "Bearingmounthour" loosely in place to the "base11" with 4 off M3 bolts, nyloc nuts and 8 washers.

Once the geared turntable in in place the hour stepper motor is adjusted so it meshes correctly with the turntable gears.

Mount the hour stepper motor on top of the "Bearingmounthour" and fit the "Hi-Gear-56-Teeth" onto the motor spindle.

Mount the minutes stepper motor in place in the center of the clock.

The 3D printed part "Hi-Gear-56-Teeth" is pushed onto the hour stepper shaft below the bracket once the hour stepper has been mounted.

Glue a neodymium manget with super glue to the "MagnetMountMins" then super glue the "MagnetMountMins" to the rear shaft of the minute stepper.

Fit the hall sensors to the "HallSensorMountHour" and "HallSensorMountMin" brackets with M2 Nyloc nuts, bolts and washer.

Fit the "HallSensorMountMin" bracket in place with M2 self tappers close to the minute sensor magnet so the hall sensor is triggered when the "MagnetMountMins" attached to the stepper shaft rotates.

Note there are no holes printed fo the backets so mark and pre-drill holes as required.

There is a bit of adjustment built into both brackets.

The "MagnetMountMins" attachemennt to the stepper shaft is very fragile so I have designed a protective cover that just slots over the rear of the minute stepper.

"HallSensorCoverMins" in place over the minutes stepper motor and sensor mount.

The Vero Boards, and modules are mounted on 5mm 3D printed "verspacers".

The spacers accept 2mm self tappers and holes for these will need to be drilled as required.

Vero Boards and modules fixed in place with 2mm self tappers.

Three support/fixing brackets are made up from these parts 1 off "MinuteRingBracket", 1 off "MinuteRingOuterBracket" and 1 off "turntableBracket".

See picture below for location and fixing details. Fixings with M3 Bolts, Nyloc nuts and washers. The only exception is the "turntableBracket" is fixed with a single M2 self tapper.

Brackets in place ready to fix to the base/clock surround

The "hourring" below is fitted to the top of the turntable with 6 off 2mm self tappers.

Turntable fixed through the back to the "hourring" with M2 self tappers.

The Geared turntable is fixed to the turntable with self tapping screws. Ensure the geared turntable is fitted in the exact center of the turntable as this is a rotating part.

Note the spigot glued to the middle of the geared turntable.

Picture of complete turntable. Washers under the M2 self tapper are there to prevent the selftappers from showing throught the hour ring.

Depending on the length of M2 self tappers you have available these mat not be required.

The main clock body loacted in place inside the geared turntable.

Note the hour gears meshing and the center bearing located over the spigot. This bearing and the three black bearings take the weight of the geared turntable, turntable and tank body.

Completed turntable fitted to the clock movement (from below). This is now ready to mount into the clock surround.

The case is fixed to the wooden base and movement.

The case fits into 4 off "baseouterfixings" which are fixed to the wooden base with 2 off M2 selftappers each.

Mount the clock movement onto the base losely at first.

Line up the badge with the middle of the control panel and fix the clock case in place.

If you have fitted LED lighting plug the LEDs into the controller before putting the case on.

Top view showing the case in place.

The upper fixings of 3 x M2 self tappers locate into the turntablebrackets.

4 x M2 bolts hold the case to the "baseouterfixings" via drilled holes.

Once the case is fixed in place lower the completed turntable onto the geared turntable ensring that the gears are engaged.

Ensure that there is an even gap all round the turntable then remove the turntable and tighten the screws on the "baseouterfixings".

Replace the turntable.

Fit the "spindle connector in place on the minute bearing spindle and ensure when the spindle turns it stays centered.

Spindle connector in place.

Remove the turret and engine cover from the Sherman Tank model.

Locate the tank body over the spindle through the hole cut in the tank body floor.

Turn the tank body to half way between 12 and 1 on the hour ring.

Align the turret to 0 on the minutes ring and tighten the lock screw.

Test every thing is fine by reseting the clock and checking the tank turret points to zero minutes and the tank body/hour ring stops at 1 hour.

Vero Board Layouts full size layouts available here http://www.brettoliver.org.uk/Sherman_Tank_Clock/sherman_tank_clock.htm#vero

Note Vero Board will need to be trimmed around 3D printed part "base11".

Layouts without modules in place

Layouts with modules in place

Rear Veiw

Full size schematic here http://www.brettoliver.org.uk/Sherman_Tank_Clock/sherman_tank_clock.htm#schematic

Depending on your model kit you may have all the decals you require. If not 3rd party decals are available or you can print your own.

Here are the decals for the clock. Print the decals to the size shown in the images below.
Download full size decals here http://www.brettoliver.org.uk/Sherman_Tank_Clock/sherman_tank_clock.htm#Decals

Control Panel

Hour Ring
Hour decal fitting instructions

With the hour ring attached to the turntable and the turntable in place on the clock.

Turn on the clock and let it move to the home positions with both the End Stop LEDs illuminated.

Apply the hours decal making sure the 1 lines up with the center of the badge on the front of the clock.

Minute Ring

http://www.brettoliver.org.uk/Sherman_Tank_Clock/images/Tank_Clock_v32_web.zip

Code for the ESP32 Wroom32D

http://www.brettoliver.org.uk/Sherman_Tank_Clock/sherman_tank_clock.htm#Downloads