Replacement Knobs, Feet and Fittings for Test Equipment

[beanflying]

Why - Because old bits break or are lost or stolen before we get hold of the Test Equipment.

Solution - Try and buy the unobtanium from generally an overpriced evilbay auction or in the remote and forlorn hope a manufacturer will still have stock for your 40 year old precious. Or you make or have made for yourself a replacement by a range of different methods.

So rather than having solutions to this problem lost diluted and otherwise dispersed here in sometimes long winded threads (Yes TEA I am looking at you ) and across the WEB time for a common index page with links to posts, videos or elsewhere.

Any Knob, Foot, Clip, adapter and fairly much anything mechanical you have made or designed as a solution to keep your Test Equipment in use.

STL or CAD files can be put in a Zip and added to posts would be great. Anyone found using that work for commercial gain without express permission can expect to be

[beanflying]

Index by Manufacturer - others to follow as needed.

Fluke

Foot 5200A Calibrator Foot The DefPom Thingiverse
Foot Side Clip and rubber, suits  5440B/510x/850x and others?  Beanflying Link to this thread
Foot Rear suits 8505A or 8506A part #645945 Pigrew Thingiverse
Various from a Yeggi Site search https://www.yeggi.com/q/fluke/


Hewlett Packard

Adapter IR adapter Handheld Agilent/Keysight meters https://www.thingiverse.com/thing:2596378
Bezel Analogue Meter Power Supplies suits ? https://www.thingiverse.com/thing:225449
Bezel Rear to suit 34401A and maybe other similar cases https://www.thingiverse.com/thing:2186112
Bezel CRT and Switch to suit 8753C VNA Hendorog Thingyverse listed as a WIP
Button Power and extension to suit E3631A and maybe others? https://www.thingiverse.com/thing:1829229
Button Power suits 3478A and maybe others kirill_ka Forum link here
Button Power suits 8640B + others https://www.thingiverse.com/thing:2780202
Cover System Power Supplies rear Outlet https://www.thingiverse.com/thing:2476186
Cover HP909 A C & E rear outlet termination https://www.thingiverse.com/thing:2813343
Foot Clip in suits a wide range of Gear The DefPom Thingiverse & https://www.thingiverse.com/thing:2332520
Foot, Suits 5300A &B and other Aluminium Diecast Cases Beanflying link to this thread
Foot, Suits 34702A, 5300A & B and other Aluminium Cases VK5RC's take on the foot above
Foot, Rear 8565A spectrum analyzer should suit others https://www.thingiverse.com/thing:2492594
Foot, Rear part number 5041-8821 / 5040-7221 older Spec Analyzers and others TerrorOperative Thingiverse
Foot, Front and Rear to suit 8590 Spectrum Analyser and maybe others Bicurico link to this thread
Foot, Generic 40mm long cord wrap replacement for older HP 17XX scopes and other equipment. Beanflying link to this thread
Foot, Generic 35mm long cord wrap replacement for older HP 17XX scopes and other equipment. (correct length) Beanflying link to this thread
Foot, Snap in to suit 3458B and others CatilinaWOW link to this thread
Frame Clip and PCB mount, suits 5300A and 5300B based measuring systems Beanflying link to this thread
Knob 1/4" Plain shaft with CAD files via link. Details here Beanflying link to this thread
Knob 1/4" Plain shaft with Cad Files via link. Tweaked version of one line up! Beanflying link to this thread
Knob 1/4" Push on simple HP'ish style by JohnPi https://www.thingiverse.com/thing:3546393
Panel LAN outlet for DSO2000/3000 Scopes https://www.thingiverse.com/thing:2594001
Panel Support Input Assembly 3403C https://www.thingiverse.com/thing:1886419
PCB Card Lever Suits older Card based equipment (4261A + others) The DefPom - Thiniverse
Various from a Yeggi Site search (sorry lots of NON Test gear too) https://www.yeggi.com/q/hewlett+packard/
Wheel/Knob Logic Analyzers DaJMasta https://www.thingiverse.com/thing:3471479
82143A Thermal printer parts VK5RC link to this thread



Keithley

Foot suits 2xxx series gear Pigrew Thingiverse



LeCroy

Foot, Extra Rubber Foot Bumper for Wavepro/Master and multiple other models DaJmasta https://www.thingiverse.com/thing:3437386
Foot, Rear Wavepro/Master with rubber insert DaJMasta https://www.thingiverse.com/thing:3437363
Various from a Yeggi Site search https://www.yeggi.com/q/lecroy/



Racal-Dana

Button Numerical Keyboard set suits some Counters Pigrew Thingiverse



Rhode & Shwarz

Foot, Extra Rubber Foot Bumper for multiple models DaJMasta https://www.thingiverse.com/thing:3453904
Knob, Encoder suits CMU2000 & CRTU Bucurico link to this thread



Stanford Research Systems

Button, Power for SR560 Pre Amp DaJMasta may suit others https://www.thingiverse.com/thing:3463854
Bezel, Front for SR560 Pre Amp DaJMasta https://www.thingiverse.com/thing:3463843



Tektronix

Clip, Plugin pull tab suits TM503 and others? CatilinaWOW and again a few posts later
Foot, Rear Cable Wrap Suits 500 Mainframes and 400 series Scopes Rerouter link to this thread
Knob, Vertical Gain extension to suit SC504 CatilinaWOW link to this thread  Link to files
Various from a Yeggi site search https://www.yeggi.com/q/tektronix/?s=tt



Valhalla

Foot Rear suits 2703 AC Calibrator The DefPom Thingiverse
Handle Front suits 2703 AC Calibrator The DefPom Thingiverse

Non Brand Specific designs

121GW Bumper Hangers - Magnetic and Webbing Beanflying link to this thread
121GW Tilting Bail extension Chlor link to Thingiverse
Anti Vibration Fan Gaskets - various sizes (TPU or similar flexible filament) DaJMasta Thingiverse
Xantrex power supply Button - Power may suit others too salvagedcircuitry link to this thread

[beanflying]

Construction Techniques and How to Guides

YouTube Videos

Cloning Vintage Knobs

Code: [Select]

https://youtu.be/aNBHtlhlHF4
Quick/Easy Knobs

Code: [Select]

https://youtu.be/qBBqvF8koJI
How To Mold & Cast Vintage Radio Knobs

Code: [Select]

https://youtu.be/sHH6WHNoLoI

Other Web Pages

Repair a HP Knob by TerraHertz http://everist.org/NobLog/20131122_an_actual_knob.htm


Recommended Secondhand Dealers of Unobtanium

https://www.sphere.bc.ca/index.html all sorts of Test Gear Spares
https://www.surplussales.com/ lots of bits and spares

[beanflying]

Rear Foot to Suit Hewlett Packard 5300 A & B and other Split Aluminium Cased HP equipment.

Fairly simple to start this thread off. 3D printed solution to what seems to be a fairly common failure of the original plastic foot. Printed in PLA as pictured with supports on the bed. Use 0.1mm Layer height if you want a smoother look but no one else should be looking under there to see

Zip file contains both the STL and Fusion 360 CAD file.

[Rerouter]

Rear cable wrap feet and wire securing clip for Tektronics 500 series mainframes and 400 series scopes.

Edit: I have to ask for your HP feet why you didn't flatten off the middle area instead of doing 1:1,

[beanflying]

Same Aluminium case design but more specifically for the Hewlett Packard 5300A and 5300B with the quick release mechanism.

These models use a two piece clip to hold the circuit boards and front and rear split fascias in place as shown. Between the two I have at present they had a broken one of each. Today's project D&C a new one using Fusion and 3D printing again but made as a one piece item.

Mk1 and MK3 shown less parts and better clearance for the circuit board. Printed with the Web facing down and bed supports only. PLA 0.1mm height recommended.

Zip contains the STL and Fusion Cad file.

[beanflying]

Rear cable wrap feet and wire securing clip for Tektronics 500 series mainframes and 400 series scopes.

Edit: I have to ask for your HP feet why you didn't flatten off the middle area instead of doing 1:1,

It felt good at the time I guess I was keeping it more original, printing it side on would have got a better finish but lower strength. Rob AKA VK5RC has done a foot for the same series with a flat base he might like to add?

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

[DaJMasta]

Thingiverse already has a few, and I've put a few of my own creations up there: https://www.thingiverse.com/DaJMasta/designs
Some lecroy scope feet/bumpers based off another member's work
A knob for a 169XX/168XX series logic analyzer encoder
A front bezel and power button for an SRS SR560 preamp (may fit other bits of theirs, like the high voltage power supply and function gen, they look similar)
Rohde & Schwarz foot bumpers for some instruments from earlyish 2000s up until a couple of kinds today (fits UPV/AMU and likely many others)

[beanflying]

Thingiverse already has a few, and I've put a few of my own creations up there: https://www.thingiverse.com/DaJMasta/designs
Some lecroy scope feet/bumpers based off another member's work
A knob for a 169XX/168XX series logic analyzer encoder
A front bezel and power button for an SRS SR560 preamp (may fit other bits of theirs, like the high voltage power supply and function gen, they look similar)
Rohde & Schwarz foot bumpers for some instruments from earlyish 2000s up until a couple of kinds today (fits UPV/AMU and likely many others)

Thanks. I do plan to link as many appropriate items I can find on on Thingyverse. I do have a few from the defpom and others bookmarked.

Anyone want to save me some time feel free to add a link here 

[Inverted18650]

Right on. I will work out this project this weekend. I will upload pics and measurements as well as all STL/CAD files so they can be fixed if I make a mistake. Stoked and this thread is long over due...

Note: I have a small foundry here as well and have used my 3D prints as casts to pour molten aluminum over with great success. In a sand cast the heat from the molten melt dissolved the plastic instantly for a solid metal product. I keep to small parts with my setup but I could see this thread blowing up between 3D and foundry’s.

[beanflying]

Added a few of the already provided links above to the first posts. Let me know if you think it needs to be done differently before the list gets to long?

[GregDunn]

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Are those the same size as the HP 6236B knobs?  I see a fair number of HP devices with broken or partially missing knobs that could use them. 

[Inverted18650]

Do you want us to PM you with details so you can arrange it or post them here? I don’t want to mees up when I am really trying to help...done that before...lol

[beanflying]

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Are those the same size as the HP 6236B knobs?  I see a fair number of HP devices with broken or partially missing knobs that could use them. 

Unsure about compatibility. I was going to make a size for size clone as close as I can to the genuine item and it won't take much to do a version with and without the Brass insert. Most likely the whole plastic one I will base on using 2mm knurl nuts (inserted from the bore) and grub screws. The other will be a matter of heating the current brass insert then squeeze it into the knob.

I will do a photo montage of how to insert knurl nuts into 3D prints or chase up a Video that already shows them in use.

Do you want us to PM you with details so you can arrange it or post them here? I don’t want to mees up when I am really trying to help...done that before...lol

Just post any and all here and I will then link the individual post, thread or link as above. Add your own photos, files and any comments you think needed to make it I guess.

[GregDunn]

I grabbed my calipers and found that the diameter at the flared part of the knob, where it's widest, is about 1.6cm and coincidentally the length of the knob is also pretty close to 1.6cm.  So if that's about the same as yours, it's pretty certain to be the same knob.

[duak]

I'd like to find a speed knob, ie. one with a small rotating handle, to replace the 13 mm diameter knob on the multurn controls on some hp equipment.  eg., I have an hp 6002A power supply that uses 10 turn pots for the voltage and current settings.  I don't use the supply as much because it takes so much longer to get the desired setting making it inconvenient for quick tests.  hp did make a compatible speed knob for one instrument but they are as scarce as hens teeth.  I've been thinking of making one where a small hp  knob is the rotating bit on the end of eccentric that attaches to the control's shaft.  I've also thought about replacing the controls with encoders and some electronics to implement a ballistic or variable speed adjustment.  ie., the faster the control is turned, the greater the change in the setting.

I'd also like to find a switch guard that protects switches or other controls from being damaged.  I saw some spiffy looking ones on the Space Shuttle console.  Some enthusiasts are making copies but they're too pricey for me.  The ones made of folded sheet metal look out of place on hp equipment.

[HalFET]

I'd like to find a speed knob, ie. one with a small rotating handle, to replace the 13 mm diameter knob on the multurn controls on some hp equipment.  eg., I have an hp 6002A power supply that uses 10 turn pots for the voltage and current settings.  I don't use the supply as much because it takes so much longer to get the desired setting making it inconvenient for quick tests.  hp did make a compatible speed knob for one instrument but they are as scarce as hens teeth.  I've been thinking of making one where a small hp  knob is the rotating bit on the end of eccentric that attaches to the control's shaft.  I've also thought about replacing the controls with encoders and some electronics to implement a ballistic or variable speed adjustment.  ie., the faster the control is turned, the greater the change in the setting.

I'd also like to find a switch guard that protects switches or other controls from being damaged.  I saw some spiffy looking ones on the Space Shuttle console.  Some enthusiasts are making copies but they're too pricey for me.  The ones made of folded sheet metal look out of place on hp equipment.

I wonder if you could get better result with with using acetone polished 3D prints and then give them a coat of matte metallic spray paint and lacquer to protect the metal finish. Alternatively, a block of metal, a drill and a few files could work. Getting that HP surface finish on it might be a bit tricky though.

[Neomys Sapiens]

Information on various sub-types of Tektronix TM500 latch tabs is here:
https://www.eevblog.com/forum/testgear/tm503-plug-in-broken-removal-levertabpull-help!

[GregDunn]

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Knob shown in your 5302 picture is in fact the p/n 0370-1099 which is the same part as on the 6236B.  If I may suggest: providing a .stl file for the knob (or even just the cap which covers the end!) would make many new friends and maybe bring you a little $$$.  They seem to be very much in demand and going for $20 and up - on everyone's favorite auction site.    I'm watching a few 6236B units right now, and ALL of them are missing knob caps.

[ferdieCX]

You will find here some CAD files to print Tektronix feet and knobs

https://www.yeggi.com/q/tektronix/?s=tt

[beanflying]

Next project is some sort of knob outer for this brass insert on the same chassis or I may just make a new one from scratch - tomorrow's job.

Knob shown in your 5302 picture is in fact the p/n 0370-1099 which is the same part as on the 6236B.  If I may suggest: providing a .stl file for the knob (or even just the cap which covers the end!) would make many new friends and maybe bring you a little $$$.  They seem to be very much in demand and going for $20 and up - on everyone's favorite auction site.    I'm watching a few 6236B units right now, and ALL of them are missing knob caps.

Yep looks like it Knobs like this with fine detail look like a candidate for 0.2mm nozzles or better again SLA printing or even resin casting (like in the linked videos on post #3)

Given the metal ring is likely gone if the cap is then I will try a snap in replacement based on that as well as a version with the metal ring. This part will be fine with FDM @0.1 layer I reckon.

The main body will be a similar option. One reusing the Brass insert from the original fused back in and another in straight plastic with knurl nuts for the grubscrews.

Thanks to the others for Links I will add them up soon 

[beanflying]

You will find here some CAD files to print Tektronix feet and knobs

https://www.yeggi.com/q/tektronix/?s=tt

Thanks I had forgotten about Yeggi. Works well for some but no so much for Hewlett Packard unless you sort past the Notepad widgets 

[beanflying]

Mk1 HP Knob to see if the knurl section will 3D print 'ok' before going further with the other detail and parts. Printed with with supports (internal) with a 0.4mm nozzle 0.1 layer with PLA on one of my Ender Pro's.

Odd blobbing off the Ender on the sample I haven't ever seen before (might be nozzle or slicing issue)  Looks like you can print the 40 flutes on these with FDM and a 0.4 nozzle but if you want to get a better cosmetic look 0.2mm or an alternate method would be better.

Based on this roughy I will continue on with the plan a couple of posts back and leave it up to the individual how they make it from there.

[Rerouter]

you need more cooling if you want to pull it off correctly, Also the bubbling on some of the splines is because its decelerating at the corner of the splines, radius both the inside and outside to make it more like a correlated roof and they should reduce.

[0culus]

Another part that would be useful (but I don't have any plans for) are those little plastic bumpers that screw onto the back corners of the rear panels of HP equipment.