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By my maths, Felder's specifications are a little over-optimistic. If the maximum static pressure is 2,150Pa, then the fan should be moving around 600m3/hr/HP - so being a little generous, the flow rate of that extractor (assuming no losses) is about 2/3 the stated 3,100m3/h. Add in the pressure...

Depends how uneven the floor is. If you use a bonded screed, I would consider a thickness of about 30mm to be the minimum - but that means the floor at its highest point will be up by 30mm, you can't just feather it. It sounds like what you are trying to do is more suited to spot grinding and...

By small number I mean a small number of sizes, not necessarily a small number of operations. And if it's plain MDF (the OP doesn't state whether it's veneered or not but I assume not here) then there is no need for a scoring blade, a sharp cross-cut blade will do the job fine. With a spacing...

If all you want to do is rip sheet goods length ways in a small number of repeatable widths, I would use a track saw. Get a long rail (2.7m) and use a jig to set a consistent spacing for each cut. Should see change out of £1000 with a decent extractor even if you go Festool. Sent from my...

I have this jig; I encountered difficulty with the guide bush method of getting a perfectly sized hole as well. The jig itself is very nicely made, but I think using a guide bush to get the exact hole size is a bit of a PITA. I'm planning to make a guide bush for my router sized to exactly match...

Lovely job. It's very rewarding to put all that effort in and get such a good result that will last a lifetime. Sent from my SM-N910F using Tapatalk

I use my drills for metal as well as wood, I'm very impressed with my Dormer set (A002). Sent from my SM-N910F using Tapatalk

My floor was about 25m2 and initially like you I thought I could use a 6" ROS, since I already owned one and my floor being new blocks was already reasonably level. I think I saved more in chiropractor fees by hiring a dedicated floor sander. About an hour of sanding back the varnish with the...

The Floor varnish thread was in relation to the same floor, but I covered all the work including pictures on this thread: lounge-remodelling-t92613.html

I laid an oak parquet floor about 18 months ago, I used new oak blocks as I didn't have the time to source and prepare old blocks. I used the same Lecol products as you which worked great. Sub floor preparation is key. I used self leveling compound on a concrete floor, the results were...

Yes that's precisely the reason that paper filters are pleated. Sent from my SM-N910F using Tapatalk

I had a look at the Donaldson website - that is a serious looking bit of kit! You need to know two things to size your filters - your expected flow rate and the maximum pressure drop you can tolerate across the filter. What generates the pressure drop is forcing more air across a filter with the...

Yes it does explain that. I should say though that I looked into it after my post and stupidly realised that by the formulae in that document pressure drop is a function of the inlet and outlet diameter, affecting the Euler number by cyclone diameter alone doesn't come into it. To get a sensible...

The document I linked to is explicitly for cyclones and I doubt that it is directly relevant for Thien designs. However, if I were designing a Thien baffle, then I think to a first approximation I would: Size the inlet and outlet diameters to be about the same and of comparable size to my...

Ok. Based on your dimensions, I think your pressure drop is around 200mm of water and your 50% particle separation efficiency should be about 1.3 microns. This compares quite well with other designs - for example, Bill Pentz's 18" cyclone with 1,000 CFM air flow works out to give a pressure drop...

TVR Griffiths and Chimaeras are known for cracking in the original walnut veneer dashes, a number of people have had a go at replacements so some useful experience to be found online with a search. Currently have the dash off my Griff if you want any close up pics of how it's made. Sent from my...

I've had a look through my notes now. I reckon your cyclone pressure drop should be around 180mm of water, which is close to ideal for maximum separation efficiency of fine dust. However, as previously stated, I think your fluid velocities in the top of the cone are likely to be really low...

Ok. I think your extractor is rated to about 50 litres/sec of air (according to Toolstation's website anyway). In 62mm diameter pipe, the mean flow speed works out to be about 16.5m/s, which is about the minimum you want to avoid material falling out of suspension in the air stream (most people...

Is your extractor the SIP 01929 - the 1.5hp HPLV one? A cyclone for that should be about 6" diameter and an inlet size of around 2.5". When you say your cyclone is 3" - do you mean that is the diameter of the inlet or the diameter of the cone at the top?

A cyclone is sized by a lot more than just the inlet diameter though - did you make or buy? I presume you are using a high flow extractor - what size is it? Sent from my SM-N910F using Tapatalk