Search found 86 matches

by tgss
Sun May 26, 2019 12:03 pm
Forum: Specimens, samples and slides
Topic: Tried glycerin to slow down fast movers
Replies: 36
Views: 5729

Re: Tried glycerin to slow down fast movers

Note that, as used in wallpaper paste, it typically has a fungicide added.
Tom
by tgss
Fri May 24, 2019 10:30 pm
Forum: Pictures and Videos
Topic: Rhabdonema adriaticum (diatom)
Replies: 3
Views: 1454

Re: Rhabdonema adriaticum (diatom)

Wonderful image 75RR. Keep 'em coming!

Tom
by tgss
Thu May 23, 2019 3:08 pm
Forum: Introduce yourself
Topic: Hi from East Anglia (UK)
Replies: 6
Views: 3254

Re: Hi from East Anglia (UK)

Hi Dave S As another relative newcomer to the forum I can assure you you have made a good choice to join. A very knowledgeable, helpful and friendly bunch of people. And the forum has a vast store of information from past posts so, if you're inclined, there is lots to read and a great opportunity to...
by tgss
Wed May 22, 2019 11:40 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

hi again billbillt Thank you for the information and the link regarding resettable fuses. I was not familiar with these devices and they look to be very useful. They also look identical to metal oxide varistors! You've inspired me to check these devices out, and from what I've read, despite their si...
by tgss
Wed May 22, 2019 8:56 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hi billbillt I'm assuming it's a metal oxide varistor, but just because it looks like one and it's where you would expect to find one. I guess that's a sort of self resetting fuse, in that it goes to a low resistance if the voltage spikes above a certain level and absorbs the energy from the spike a...
by tgss
Wed May 22, 2019 7:50 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Thank you Hobbyst46 and John B. You have both touched on one of the main reasons I decided to purchase this unit despite its non-working state (apart from the good price of course!). I hate to see equipment like this junked when it can be brought back into a servicable state with a little work, thou...
by tgss
Wed May 22, 2019 7:02 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hi everyone Well, it looks like Hobbyst46 gets top marks and a gold star :!: I spent some time yesterday afternoon and this morning tracing the circuitry of the microtome from the power socket on, and, to cut a long story short, discovered that the feed from the neutral line input was not making it ...
by tgss
Tue May 21, 2019 7:43 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hello PrecisionInstruments By the looks, you have a RM2045. A semi motorised beautiful specimen. The advance mechanism from these series (2035, 2045, 2055) are still used today on the Leica RM2125RTS. The advance and retraction is purely mechanically driven. The only electronic function in the speci...
by tgss
Tue May 21, 2019 7:33 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hello again Hobbyst46 May I cite a relatively uknown fundamental law of electrical and electronics instrumentation, which states that 95% of the failures are caused by bad contacts rather than burnt components or boards. This law holds even when Ohm's and Kirchoff's laws fail :lol: So I would start ...
by tgss
Tue May 21, 2019 11:20 am
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Not a silly question at all Roldorf and John B. This is a 120 volt system (I am in Canada) so there is no plug fuse. The system fuse holder is in the base of the machine, so you have to turn it onto its side to get at it. But yes, it was the first thing I checked and the 500 mA fuse is fine. I'm sor...
by tgss
Mon May 20, 2019 10:36 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

mrsonchus and Hobbyst46 As you will see when I post more pics, the electrical dependence is significant. A fact that, if I do need to buy another used machine, will persuade me to buy one of its purely manual brothers - that way the accessories will fit. Yes, the section counter is electrical, but s...
by tgss
Mon May 20, 2019 5:03 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Ahhhh Roldorf and John B Now you're getting to the nitty gritty ;) I just purchased the machine, originally purported to be working, but subsequently found to be non-working. It came with the cassette chuck and two blade holders. One blade holder purpose designed for disposable blades, one for tradi...
by tgss
Sun May 19, 2019 10:56 pm
Forum: Pictures and Videos
Topic: Diatom with somewhere to go
Replies: 15
Views: 4617

Re: Diatom with somewhere to go

Very nice image 75RR and I very much liked the Star Wars battle cruiserish way in which the diatom glided unstoppably across the screen while lesser creatures wiggled (cringed?) in the background! As for "The Day of the Triffids", I have enjoyed all of John Wyndham's SF novels several times now - I ...
by tgss
Sun May 19, 2019 10:00 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Thank you John B and Roldorf. Some pictures of the Reichert-Jung cassette chuck assembly process - or, working backwards, disassembly process. Taken to aid my failing memory, in the hope that I remember I took them... and where they are! And in the hope they may be of benefit to others with similar ...
by tgss
Sun May 19, 2019 2:43 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

A quick update. Success :D It turns out the trick with this chuck is not to lock the block holder and unscrew it, but to loosen the clamp lever completely, then pull the lever and its camshaft radially, right out of the chuck, at which point the block holder and its attached spherical mount can be p...
by tgss
Sun May 19, 2019 12:17 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hello Roldorf and John B Firstly, thank you Roldorf for the link. At least I now know what I am aiming at, and of course once seen it makes perfect sense! Secondly, thank you John B for the explanation of how to get there. As soon as I read these two posts I ran out to the "shop/lab" in my pyjamas t...
by tgss
Sat May 18, 2019 8:19 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Hi Hobbyst46 Thank you for the suggestion. So far I have been using only manual force - my recently increasingly arthritic (or maybe carpal tunnel?) blighted wrists! Your idea coincides with thoughts I have been having - for the future - if necessary - and no-one comes up with a slicker approach bas...
by tgss
Sat May 18, 2019 7:04 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

Re: How to remove Reichert microtome chuck?

Thank you Peter for the very good suggestions. It hadn't occurred to me that the set screw may only be a locking screw. Unfortunately, when removed, it didn't look like there was another screw underneath. In fact the screw I removed has the end turned down to a smooth diameter, and has the end radiu...
by tgss
Sat May 18, 2019 3:58 pm
Forum: Microscopy accessories
Topic: How to remove Reichert microtome chuck?
Replies: 34
Views: 6752

How to remove Reichert microtome chuck?

I need to remove the chuck from a Reichert microtome to allow removal of the cover. As can be seen in the pic below there is a set screw near the end of the ram, which I assumed might be part of the retaining system for the chuck. But even with the set screw loosened I have been unable to move the c...
by tgss
Fri May 10, 2019 11:25 am
Forum: Microscopy accessories
Topic: AO 820 Microtome Retract Question
Replies: 2
Views: 941

Re: AO 820 Microtome Retract Question

Thank you wporter. That clears things up perfectly. Appreciate you taking the time to respond.
Tom
by tgss
Thu May 09, 2019 1:38 pm
Forum: Microscopy accessories
Topic: AO 820 Microtome Retract Question
Replies: 2
Views: 941

AO 820 Microtome Retract Question

Hello all
Can anyone tell me if the AO 820 microtome has, or ever had, a retract funtion: i.e. backing the sample away from the blade on the return stroke?

Tom
by tgss
Mon Apr 22, 2019 11:30 am
Forum: Pictures and Videos
Topic: Stentor
Replies: 7
Views: 2539

Re: Stentor

Excellent Bogdan. Very nicely done indeed and very informative.
Tom W.
by tgss
Tue Apr 16, 2019 2:44 pm
Forum: Pictures and Videos
Topic: Epiphanes sp.
Replies: 4
Views: 2866

Re: Epiphanes sp.

Wow, these are busy little guys! Excellent video Bogdan. Clear, sharp, well framed and informative, with a great choice of music. Thanks for sharing.

Tom W.
by tgss
Mon Apr 15, 2019 10:24 pm
Forum: Pictures and Videos
Topic: Garden Pendulous Sedge sectioned
Replies: 11
Views: 3448

Re: Garden Pendulous Sedge sectioned

Hi Tom, I use a Shandon 0325 retracting rotary microtome with 'Feather' disposable blades, grade S35. I routinely section at 10µ for a 'quick look' at tissue. This after a dip ... Ahh! Now I understand. 10µ for a 'quick look' eh! Sure, why not :roll: Lovely equipment and lovely work John. I obvious...
by tgss
Mon Apr 15, 2019 8:12 pm
Forum: Pictures and Videos
Topic: Garden Pendulous Sedge sectioned
Replies: 11
Views: 3448

Re: Garden Pendulous Sedge sectioned

Hi John
Definitely another winner. Excellent material. You mentioned in your initial post the the sections shown were either 5 or 10 microns. Pretty thin for plant sections - what type of microtome are you using?

Regards
Tom W.
by tgss
Sun Apr 14, 2019 10:43 pm
Forum: Pictures and Videos
Topic: Garden Pendulous Sedge sectioned
Replies: 11
Views: 3448

Re: Garden Pendulous Sedge sectioned

Very nice sections and photographs, and the descriptions, explanations and labelling are particularly appreciated.

Thanks for sharing.

Tom W.