Dimensions of the heater fastening screw and washer on the block?

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reibuehl
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Dimensions of the heater fastening screw and washer on the block?

Post by reibuehl »

Hi all,

I am looking for the dimensions of the screw and the (spring?) washer that are used to fasten the heater and the temp sensor in the Olson block. The screw is a countersunk head M3 screw (ISO 10642/DIN 7991 or the Philips head equivalent of it I assume), but how long and what is the little washer? Any ideas?

Best regards,
Reiner
gudo
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by gudo »

Hi to all,
Hi reibuehl
Yes it's a M3x16mm countersunk head or equivalent with a 3/3.2mm ID AS1969 external tooth lock washer Type A or equivalent ASME B18.21.2M
reibuehl
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by reibuehl »

Thanks gudo! That would be a DIN 6797 Type A washer here in Germany then. I really hope I find a place that sells that stuff in quantities below 100s :-)
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Izzy
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by Izzy »

Have a check on eBay for kayfast1.
I've gotten various fasteners from them. Good quick delivery.
gudo
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by gudo »

personaly I use a 3mm ID x 6 mm OD x 0.3 mm special round washer it works as well with no risk to mark/deform the sensor housing, I experienced that by damaging one temp sensor because of a small over tightening with the original washer.
The sensors have tendency to stay in place by only their wires attached to the print head, it more to press them in the heat block holes for getting a good thermal transfer.
If you want I can post you some of these special washers , I got a box of 1000 units of that !
reibuehl
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by reibuehl »

I have the opposite issue: On both of my blocks, the sensors slip out even though the screws are tightened fairly good. The heater stays but the sensors are so loose that i can just pull them out.
I will check my assortments of different nuts&bolts this weekend to see if I have some matching washers somewhere. If not, I might come back to your offer, thanks! :-)
Anders Olsson
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by Anders Olsson »

The quality of the blocks improved hugely when manufacturing was moved to Sweden in beginning of 2016.
On blocks delivered before that, the holes were sometimes misaligned, which meant one has to use excessive force to fix both the heater and the sensor.

The washer was also changed early 2016, from one that looks like this:
Old washer.jpg
Old washer.jpg (16.41 KiB) Viewed 10973 times
To one that looks approximately like this:
New washer.jpg
New washer.jpg (8.71 KiB) Viewed 10973 times
The new washer is mounted on blocks sold by Ultimaker and by 3DVerkstan and their resellers from early 2016.
reibuehl
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Re: Dimensions of the heater fastening screw and washer on the block?

Post by reibuehl »

The new washer is a DIN 6798 A. I ordered 10 now.
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