dremel phemt

Jul 04, 2021 Last reply: 5 years ago 10 Replies

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jlarkin 5 years ago

I'm trying to do some DC/pulse testing on a phemt, partly to validate a Spice model. The RF data sheets are mostly useless for time domain use.

The danged thing keeps oscillating on a regular surfmount adapter, and that makes measurements weird. So I hacked this.

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SOT-143 is about my resolution limit for handheld dremeling. It probably doesn't need the vias... the edge launch SMA connectors connect both sides pretty well.

Our general impression is that you can drive these things really hard and get unexpected results, at suitably low duty cycles. We take Abs Max ratings as polite suggestions.

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jlarkin 5 years ago

Shot with the Samsung phone. There's a selfie in there!

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jlarkin 5 years ago

I have a fairly ordinary variable-speed Dremel, with a chuck instead of collets. I buy dental burrs on ebay and they last a long time.

Small drills will flail around if you spin them too fast, but the dental burrs are designed to run at absurd RPMs and are fine.

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Gerhard Hoffmann 5 years ago

Am 06.07.21 um 01:26 schrieb amdx:

Here in .de we have Proxxon that seems to be a notch better and cost slightly more. No idea if they are sold in the US.

cheers, Gerhard

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Spehro Pefhany 5 years ago

I see the Proxxon used in YT videos from Europe. Looks similar (but a bit nicer) than the very consumer-y Dremels.

Foredom is the professional choice for jewelers etc. It has a separate motor and flex shaft.

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Not sure if there is a Euro or Japanese equivalent. You can get pre-owned Foredom tools and they are still supported by the manufacturer.

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jlarkin 5 years ago

Maybe so, but they are a nuisance to select and install of you want to switch to a drill or something.

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jlarkin 5 years ago

The resolution of cutting FR4 freehand limited by the operator hand.

The low-end Dremels, 2 or 3 speed, aren't so good.

Amazon has the Proxxons. Proxxon has a lot of interesting small tools.

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Tom Del Rosso 5 years ago

Banggood has several sizes of collets, if those bits are loose.

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Tom Del Rosso 5 years ago

You can mount the Dremel in their drill press stand, and Banggood has an XY table for 20 bucks. It's slow but you can use it only in the hi-res areas.

The 2-speed battery powered Dremel doesn't take many charges before it dies.

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