Motion and sounds packs

Forum for discussion relating to the Sdkfz 7 Half Track
Phil Woollard
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Motion and sounds packs

Post by Phil Woollard »

She looks all fairlawn plonked in my tracked barrow ( the easiest way to move these big lumps around with a degenerative spine) I have to fit the motion and sounds packs only but still worth posting the progress as it happens.
Attachments
IMG_20230318_174911.jpg
IMG_20230318_174900.jpg
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Phil Dawe
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Re: Motion and sounds packs

Post by Phil Dawe »

That's you busy all summer Phil!

Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

Na shouldn't take long but I do have the running gear to sort out as well. I see the rear lights have be trashed in transit.
Attachments
IMG_20230319_150341.jpg
IMG_20230319_150358.jpg
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

Lots done. The body has been removed. There are some nice details on this model.
Attachments
After a short time running each track it's obvious something is rubbing, see ali dust.
After a short time running each track it's obvious something is rubbing, see ali dust.
Motors and gearboxes working well
Motors and gearboxes working well
IMG_20230329_134708.jpg
We are not sure where this tray has come from but it's not from inside this model
We are not sure where this tray has come from but it's not from inside this model
IMG_20230329_140129.jpg
We don't have this tray
We don't have this tray
Important bolts missing here and there
Important bolts missing here and there
After a bit of tin bashing the battery tray now fits
After a bit of tin bashing the battery tray now fits
That servo could turn a house over
That servo could turn a house over
IMG_20230329_143907.jpg
IMG_20230329_144636.jpg
No rubber on this sides sprocket, I may have to make the tyres
No rubber on this sides sprocket, I may have to make the tyres
I'm afraid the bonding has deteriorated over time, she was made nearly 20 years ago.
I'm afraid the bonding has deteriorated over time, she was made nearly 20 years ago.
All the wheels will need some lathe work to remove the old bonding, then all needs rebonding once more
All the wheels will need some lathe work to remove the old bonding, then all needs rebonding once more
IMG_20230329_153747.jpg
There are some nice details in that rear end.
There are some nice details in that rear end.
I can now see what I'm doing
I can now see what I'm doing
All the rubber needs rebonding, I just hope the tyres are not stretched ie going to be too slack, although if you then use epoxy once more it will fill that gap, I've just ordered some nice fresh Locktite 480 as I like to use that above all else
All the rubber needs rebonding, I just hope the tyres are not stretched ie going to be too slack, although if you then use epoxy once more it will fill that gap, I've just ordered some nice fresh Locktite 480 as I like to use that above all else
IMG_20230329_160029.jpg
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

I'm getting my teeth into her now and I am slowly finding the areas that need fetling, it's all very tight around those road wheels. It's worth noting that this model was built by its last owner as a "static" and build very well. Time in damp conditions has taken its toll.
Attachments
This right angled edge needs dressing back as it's interferes with the track during " track wip"
This right angled edge needs dressing back as it's interferes with the track during " track wip"
Bolts shaken loose and missing.
Bolts shaken loose and missing.
Rust on the bearing surface needs removing and a grease applying, if they are all tight it just won't run right.
Rust on the bearing surface needs removing and a grease applying, if they are all tight it just won't run right.
If you angle the road wheels sets like this assembly and disassembly is so much easier .
If you angle the road wheels sets like this assembly and disassembly is so much easier .
This bonded joint here pushes the tyre to far over, it needs to be flush as the clearance is crucial .
This bonded joint here pushes the tyre to far over, it needs to be flush as the clearance is crucial .
A little heat releases the adhesive.
A little heat releases the adhesive.
The double road wheel sets have copious amounts of adhesive at the rear face which is causing the tyres to rub the opposing wheel set, on its own this is not a big deal but all the road wheels rubbing this way is just to much resistance.
The double road wheel sets have copious amounts of adhesive at the rear face which is causing the tyres to rub the opposing wheel set, on its own this is not a big deal but all the road wheels rubbing this way is just to much resistance.
We may have found a new set of tyres for the half track  ( Armortek have none in stock, so look after your rubber ) but if not I can make the sprocket tyres from Tiger 1 parts, just need to get a perfect fit before bonding, I can then turn off the spare in the lathe.
We may have found a new set of tyres for the half track ( Armortek have none in stock, so look after your rubber ) but if not I can make the sprocket tyres from Tiger 1 parts, just need to get a perfect fit before bonding, I can then turn off the spare in the lathe.
IMG_20230330_160207.jpg
Surface rust prep.
Surface rust prep.
Battery tray primed, remember I'm not painting this model.
Battery tray primed, remember I'm not painting this model.
These ever so slightly protruding m3 bolts are going to damage the tyres if not dressed flush, again causing resistance.
These ever so slightly protruding m3 bolts are going to damage the tyres if not dressed flush, again causing resistance.
I'm happy with this steering servo convenient position so that's where it's going to live.
I'm happy with this steering servo convenient position so that's where it's going to live.
Checking where's best to place the front pivot axle bump stops, If you don't add these the steering joints catch the chassis frame causing all kinds of steering issues.
Checking where's best to place the front pivot axle bump stops, If you don't add these the steering joints catch the chassis frame causing all kinds of steering issues.
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

A little more done today.
Attachments
A wee but of cleaning up is required here.
A wee but of cleaning up is required here.
IMG_20230330_142704.jpg
The wheels clean up nicely ready for bonding, Locktite 480 is designed to bond rubber to metal not rubber to paint.
The wheels clean up nicely ready for bonding, Locktite 480 is designed to bond rubber to metal not rubber to paint.
IMG_20230330_144229.jpg
That's the area that is binding , the rubber on the wheel sets is slightly to proud.
That's the area that is binding , the rubber on the wheel sets is slightly to proud.
Now this technique is not recommended but it does work very well. A light pressure removes the adhesive nicely without damaging the rubber.
Now this technique is not recommended but it does work very well. A light pressure removes the adhesive nicely without damaging the rubber.
No problem with removing the taper locks
No problem with removing the taper locks
The sprocket roller pins are nice and flush so no worries there.
The sprocket roller pins are nice and flush so no worries there.
The track horns are a little tight on the sprocket so a tad of easing will be necessary with a file but not just yet until I've run it and had a look at the witness marks.
The track horns are a little tight on the sprocket so a tad of easing will be necessary with a file but not just yet until I've run it and had a look at the witness marks.
IMG_20230330_151257.jpg
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Phil Dawe
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Re: Motion and sounds packs

Post by Phil Dawe »

Phil, It looks like an engineering challenge fettling her up to get her into running order! But if anyone can do it, you can! :D

Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

Lots done this afternoon.
Attachments
IMG_20230403_165954.jpg
Deep cycle batteries arrived yesterday
Deep cycle batteries arrived yesterday
Those parts arrived boss
Those parts arrived boss
Servo brackets made, thread lock applied to all the steering nuts, in fact I'm applying thread lock to everything that needs it .
Servo brackets made, thread lock applied to all the steering nuts, in fact I'm applying thread lock to everything that needs it .
Grease applied to all the steering joints
Grease applied to all the steering joints
IMG_20230405_134635.jpg
New radio bound and working well
New radio bound and working well
IMG_20230405_150425.jpg
These areas need rounding off or the inner tyre walls will be damaged
These areas need rounding off or the inner tyre walls will be damaged
The steering servo and brackets all bolted in and working correctly via the radio.
The steering servo and brackets all bolted in and working correctly via the radio.
Fitting the bump stops
Fitting the bump stops
IMG_20230405_165026.jpg
IMG_20230405_165031.jpg
First of the drive sprockets cleaned up and the rubber bonded in place
First of the drive sprockets cleaned up and the rubber bonded in place
IMG_20230405_172012.jpg
Can anyone tell me why the designers of the Sdkfz7 went to all this trouble to incorporate this kind of cam system which allows the raising and lowering of the idler assembly?
Can anyone tell me why the designers of the Sdkfz7 went to all this trouble to incorporate this kind of cam system which allows the raising and lowering of the idler assembly?
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

She's now fighting me all the way but I'm winning.
Attachments
Mucky work
Mucky work
As we don't have new rubber some damage is filled with 480
As we don't have new rubber some damage is filled with 480
Dressing down those proud bolts
Dressing down those proud bolts
I'm having to shim a lot
I'm having to shim a lot
Before........
Before........
......After
......After
It's a grotty job but has to be done
It's a grotty job but has to be done
IMG_20230411_154120.jpg
All shimmed and in line on this side anyway.
All shimmed and in line on this side anyway.
IMG_20230411_160622.jpg
It's a messy job, my cutting mat is ruined
It's a messy job, my cutting mat is ruined
IMG_20230411_161409.jpg
Tight
Tight
IMG_20230411_171305.jpg
All nicely in line but the links won't fit the sprocket
All nicely in line but the links won't fit the sprocket
IMG_20230411_171911.jpg
IMG_20230411_171915.jpg
Will the track stretch with running and fit the sprocket or will I have to fettle each link?
Will the track stretch with running and fit the sprocket or will I have to fettle each link?
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Mark Russell
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Re: Motion and sounds packs

Post by Mark Russell »

Phil the outer diameter of the new style sprocket tyres needs be 123.5 to 124mm. The tracks will then sit correctly. I turned my glued tyres down in a lathe whilst on the sprockets.
Thanks,
Mark

Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

That makes perfect sense Mark thankyou! I shall now turn my lathe black with rubber dust.
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

I followed Marks advice and the track fits almost perfectly with just a little fetling required.
Attachments
Outside calipers makes the job quick and easy and accurate .
Outside calipers makes the job quick and easy and accurate .
IMG_20230414_155924.jpg
A quick bit of turning and we can now mount the sprocket using the taper lock.
A quick bit of turning and we can now mount the sprocket using the taper lock.
IMG_20230414_160301.jpg
IMG_20230414_160339.jpg
IMG_20230414_163023.jpg
IMG_20230414_161142.jpg
With all this work the half track will be silky smooth.
With all this work the half track will be silky smooth.
I'm very pleased with this side.
I'm very pleased with this side.
Last edited by Phil Woollard on Sun Apr 23, 2023 8:33 am, edited 1 time in total.
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

A taxing days work. It's fighting me all the way, everything interferes with its neighbour but I will methodically go through it , some of the tyres need reducing in diameter just a little to clear the hub of the adjacent wheel set, some of the rubber has a proud casting "rib" on one side which is rubbing the bobbin hubs .
Attachments
This side for some reason is a bugger.
This side for some reason is a bugger.
Trying to keep the wheel sets in their original places but I think they are already mixed up.
Trying to keep the wheel sets in their original places but I think they are already mixed up.
IMG_20230417_140706.jpg
IMG_20230417_140712.jpg
All the hidden swivels need Locktite and lube.
All the hidden swivels need Locktite and lube.
IMG_20230417_142907.jpg
Before and after
Before and after
The power file is ideal for this type of clean up job but you have to keep it moving!
The power file is ideal for this type of clean up job but you have to keep it moving!
Ready for bonding
Ready for bonding
The tyres only just fit the second time around, I think it would be a good idea if Armortek offered new rubber for these superb models, from what I have seen here the rubber is on its way out.
The tyres only just fit the second time around, I think it would be a good idea if Armortek offered new rubber for these superb models, from what I have seen here the rubber is on its way out.
A fan blowing cold air helps keep the cyno fumes away from my nostrils
A fan blowing cold air helps keep the cyno fumes away from my nostrils
That's a lot of amps for such a small vehicle.
That's a lot of amps for such a small vehicle.
Speaker bolted in place
Speaker bolted in place
Beginning to run the wires
Beginning to run the wires
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Phil Woollard
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Re: Motion and sounds packs

Post by Phil Woollard »

Lots done today.
Attachments
I use this posh hand made leather apron for the dirty jobs, it has a front pocket too.
I use this posh hand made leather apron for the dirty jobs, it has a front pocket too.
IMG_20230422_132355.jpg (253.65 KiB) Viewed 2327 times
Very messy job
Very messy job
IMG_20230422_133011.jpg
Troublesome idelers
Troublesome idelers
No turning back now
No turning back now
The only way to get the correct alignment
The only way to get the correct alignment
The idler on this side needs tweaking in by almost 2 mm
The idler on this side needs tweaking in by almost 2 mm
IMG_20230422_142232.jpg
First proper run at low rpm for this side and it's very smooth indeed, worth all the effort.
First proper run at low rpm for this side and it's very smooth indeed, worth all the effort.
IMG_20230422_150754.jpg
Before, you can see the flashing on the tyre that needs removing
Before, you can see the flashing on the tyre that needs removing
After
After
I'm always amazed at how much wire is required
I'm always amazed at how much wire is required
IMG_20230422_154801.jpg
I think that's most of the cables run
I think that's most of the cables run
Main power leads run through from the rear
Main power leads run through from the rear
Almost ready for the body to be bolted down
Almost ready for the body to be bolted down
Lots of room in here
Lots of room in here
IMG_20230422_162022.jpg
I shall make a tech tray for all the electrical boxes to sit on in that cavernous rear end
I shall make a tech tray for all the electrical boxes to sit on in that cavernous rear end
Mechanical engineer.
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bryan massie
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Re: Motion and sounds packs

Post by bryan massie »

Very busy indeed Phil, she's coming on now :D


Bry.

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