Dan Gelbart

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@alelasantillan 13 күн бұрын

Your work is amazing!

@Transmission4less 21 күн бұрын

Very impressive. Optics to thermal imaging to Kodak to UBC. Great stories i read about you. Got me confused, spending time if you can afford around basic instruments and machines. if you can express your thoughts in advanced math with videos in KZfaq so we can enjoy more from you

@marklagana2769 22 күн бұрын

are you saying you cast an LP using a silicone mold and it worked? I'm not saying it's impossible but i feel you would need such low viscocity silicone to flow into the grooves that the silicone would not be able to withstand the heat of thermoplastics. Thermoset resins maybe but the low viscocity silicone is so weak it wouldn't be very repeatable and something like polyurethane resin would probably shrink to much to be reliable. (i love your videos by the way you're my hero) i was lucky enough to work with some vintage vinyl presses, the EMI 1400 incase anyone is interested, EMI headquarters would use a special lathe to cut the grooves into either aluminum covered in acetate laquer, or copper. I believe the lathe cuts with sapphire. From this, industrial magic, not really sure but after some process negatives were created in Nickel using electroplating. These thin Nickel negatives were sent to us, protected in peelable plastic then a spray with compressed air (dust) and put onto the top and bottom stampers which were giant harderned steel flat surfaces (record shaped). The nickel would get bolted in the center and tightened around the circumference with a large threaded ring. PVC pellets would get vacuum sucked into a auger and extruded into a handful-sized plastic puck. The machine then pushed the oven dried paper labels into the top and bottom of the puck whilst also picking it up and placing it in the center between the two stampers. The stampers had low pressure steam running through internal pipes very hot, they would close together (i think also using steam power), and pause to allow the PVC to re-melt at this hotter temp, i think then the stampers closed together slowly to the final position and paused to allow the pvc to flow into the grooves. The steam in the stampers was replaced with cold water, they would open and the solidified record would be stuck to the bottom stamper, where a hot knife would slide in to the edge and the stamper would rotate, cutting the trim. It would pop up and a linear axis would transport it to a rotational axis that gave it a guided drop into the inner sleeve then another guided fall onto the stack. All the axes were pneumatics with compressed air, the 'end stop' was to smash into the end of the axis and remain smashed And before anyone corrects me, I know the nickel negatives were actually called stampers and the giant heavy flat surfaces they bolted to were called moulds but i hate that terminology

@dgelbart 21 күн бұрын

The reason you can reproduce nanometer size details in silicone rubber of fairly high viscosity is the wetting and capillary action. Silicones in general have very low surface tension, so they "pull themselves" into the grooves. When you press records you don't have this mechanism to help you, as the polymer does not wet the nickel, and you have to force it in. Just think how this mechanism lifts water to the top of the tallest trees. Without surface energy release (wetting in a capillary) you would need an enormous pressure to pump the water to the top of the tree. Unfortunately, the subject of surface energy, critical to so many processes, is not taught in engineering school. You are not the only one who was surprised by this process.

@marklagana2769 21 күн бұрын

@@dgelbart thanks for the reply, fascinating.

@maigurens Ай бұрын

I want one

@pipimontana Ай бұрын

+++ never operate a drill press with gloves (close to the drill) +++

@ltsky311 Ай бұрын

@dgelbart Is that the bed of your air bearing lathe in the background, it looks like the granite T blocks you made for yours with those white bolts (would love to know what those are or where to find them. Id like to try my hand at making one myself. It would be awesome if you would do a more thorough breakdown and overview of your beautiful lathe.

@peterwiles1299 Ай бұрын

Excellent presentation. Working at micron precision is probably the envy of tool makers. However, this is far from the finest precision in commercial use. The likes of ASML - Zeiss make components at the nanometer or better levels of precision on a routine basis.

@dgelbart Ай бұрын

You are correct, parts are routinely made to the nanometer level, even without lapping. I fabricated nanometer-level optical parts myself. This video was about machine tools, and the machines shown are as accurate as you'll ever need in a machine shop. When you get into optical parts the machines and techniques are very different.

@Transmission4less Ай бұрын

Will you share the mechanism used to achieve this accuracy in X direction , the encoders implemented, and the servo/stepper drivers ?

@dgelbart Ай бұрын

The accuracy is based on a high grade (grade C0) ball screw with a preloaded nut. It is driven from a microstepped stepper motor which is geared down via a timing belt. The amount of gearing is selected by the pitch of the lead screw. To get 1um error on a 5mm pitch the angular error has to be 360 degree/5000=0.072 deg. A 200 steps/revolution stepper motor is accurate to 5% of a step, or 5% of 1.8 deg=0.09 deg (at no load) so a 2:1 reduction is sufficient. Note that a rotary encoder does not increase the accuracy. The leadscrew can be error-mapper as the basic accuracy of the lead screw is not quite 1um, or a linear encoder can be used. A high torque motor is selected to limit the angular errors caused by torque variations (what is known as "power angle"). For better performance you can use a servo-motor with a built-in encoder such as teknic.com/products/clearpath-brushless-dc-servo-motors/. The couplings between the ballscre nut and the slide are critical as they should not transmit any side or tilt forces. Best type of coupling is as used here: www.universal-thread.com/downloads/Universal-Lead-Screw-Assemblies-Catalog.pdf.

@Transmission4less Ай бұрын

@@dgelbart Thank you so much for answering the parts that were taking my thoughts on how to achieve this accuracy without needing a high-precision glass absolute encoder. The info you provide about the high accuracy of the lead screw is very helpful over the ball screws.

@Transmission4less Ай бұрын

kzfaq.info/get/bejne/b7p7l5OAvbLNmX0.html

@lubos4639 Ай бұрын

I wish I could have worked for one of your companies Dan. Fantastic to have you as a master at least like this at a distance. Nothing can replace experience in the learning process, and I can only thank you for sharing this experience with all of us !

@adrianram5524 Ай бұрын

I so love listening to this guy

@cjdougherty2728 2 ай бұрын

Out of curiosity,what is the square foot of your shop?

@dgelbart 2 ай бұрын

1600 sq. ft.

@Lhyliphian 2 ай бұрын

We would love to use this footage for our feature film! Do you have an email address we could refer to for a collaboration?

@dgelbart 2 ай бұрын

Sure. Please contact me via the following email: [email protected].

@Lhyliphian 2 ай бұрын

@@dgelbart Many thanks!

@niksto 2 ай бұрын

Actually tape worms works well for loosing weight. A lot of side effects might put You of slightly.

@niksto 2 ай бұрын

The scientific community is not always nice. Ask Lize Meitner.

@dgelbart 2 ай бұрын

Also ask Ted Maiman, who built the first working laser but was denied the Nobel prize because of the jealousy of the scientists who failed to build one.

@niksto 2 ай бұрын

@@dgelbart Also Nobes testamente stated that the invention that had benefited the humanity most should have the prize. Later it have developed to be a prize for basic research. Not bad but its also nice to actually construct a gadget.

@thomapapa4006 2 ай бұрын

Hello, I just came across this channel and am amazed with your precision workshop and your knowledge. You remind me of Q from Q Branch in James Bond 007 Amazing!!! I will definately be checking out all your other videos. Best Regards Sir