Author Topic: MFT/3 MDF top warping  (Read 1316 times)

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Offline PCROSSL1

  • Posts: 2
MFT/3 MDF top warping
« on: March 03, 2018, 11:43 AM »
Does anyone have experience of using their MFT/3 in an outside unheated  workshop.  Does the MDF top warp under these conditions ?
I am contemplating purchasing an MFT/3 table after reading very many good reviews.  The only review which caused me concern was on the axminster.co.uk website – repeated below:-

"Keep it dry
……... More important is the it must be kept away from damp, otherwise the MDF top will warp alarmingly. Its something to bear in mind if its kept in an unheated garage or in site where there is a damp atmosphere."

I live in the UK and my workshop is a shed.  I heat the workshop only occasionally if I work in it in the really cold weather.   The shed is not damp but temperature will fluctuate (winter/summer)

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Offline Roseland

  • Posts: 551
Re: MFT/3 MDF top warping
« Reply #1 on: March 03, 2018, 01:58 PM »
I looked into this a while ago.  It seems MDF doesn't mind some humidity, as long as it's constant.  It's changes in humidity that cause sagging.

And yes, I researched it because, like you, I live in the UK and my MFT is in my garage, albeit an integral garage and never heated.  Perhaps being only 300 yards from the sea my humidity problem is worse than yours.

I found my top had sagged significantly after about three years, when I flipped it over.  That must have been about three years ago and it's probably time for a change (or just flip it again!)

I think the answer may be to use an Axminster Valchromat ready made top, or to make your own using Peter Parfitt's jig from Medite Tricoya Extreme.  http://www.architecturetoday.co.uk/taking-construction-storm/

I'm reluctant to brace the underside as it would compromise the positioning of clamps.

Festool have black tops in the MFTs they take on road shows, but they're not for sale.  I don't know it they are Valchromat or phenolic faced ply.

PM me if you would like any more info.

Andrew
TS55, MFT/3, OF1400, OF1010, CT26, RS100, ETS125, CXS, MFS400, DF-500, Zobos.

Offline PCROSSL1

  • Posts: 2
Re: MFT/3 MDF top warping
« Reply #2 on: March 04, 2018, 07:53 AM »
Thanks Andrew.  Your experience is reassuring.  Like you I considered it but thought I would go ahead anyway.   Especially as I have an offcut of MDF which has been hanging around in my workshop for a while and seems OK.  The Axminister review just unnerved me a bit but given your reply and the fact that nobody else seems to have a problem I am going to give it a go and buy one.
Interesting to note that MDF does not like ‘change’ in humidity rather than the humidity
Paul

Offline Rob Z

  • Posts: 701
Re: MFT/3 MDF top warping
« Reply #3 on: March 04, 2018, 08:03 AM »
Paul, our MFT tops all got 'saggy' but I never knew if it was because of hard use on jobsites or because of a property of the MDF in the variable climate of being trucks, customers' garages, etc.    Now that I am doing workshop only work, with climate control, I am going to replace my tops and hopefully  they will stay flat.

Andrew--that is interesting info in that link you posted.   

Offline jobsworth

  • Posts: 4917
  • Does Anyone Know What Time It Is?
Re: MFT/3 MDF top warping
« Reply #4 on: March 04, 2018, 10:19 AM »
When I lived in the UK for 4 years (got backlast june) I kept my 3 MFTs (2 MFT3s and one Kapex MFT) in my unheated garage shop in Huntingdon-Cambs. I had no noticeable warpage on any of them.

Only heat i had in that shop was a small protable bench top heater I used when I was working in the shop during the winter.

Offline Gregor

  • Posts: 768
Re: MFT/3 MDF top warping
« Reply #5 on: March 04, 2018, 08:49 PM »
Now that I am doing workshop only work, with climate control, I am going to replace my tops and hopefully  they will stay flat.
MDF, while it has merits for certain applications, also has drawbacks - one of them is that it isn't stable when you have it horizontally, unsupported (which you have how it is used on the MFT) and is prone to sag with time.

I would suggest to simply flip the tops over when they start to sag, they'll likely straighten themselves out (till you have to turn them again)...

Offline Corwin

  • Posts: 2537
Re: MFT/3 MDF top warping
« Reply #6 on: March 04, 2018, 10:50 PM »
Table sag was the first thing I asked about once I finally joined the FOG, and that was when the FOG was still on Yahoo. So, this is a common problem.
Looks like your rabbit joint is a hare off! ;)

Offline Roseland

  • Posts: 551
Re: MFT/3 MDF top warping
« Reply #7 on: March 05, 2018, 01:29 AM »
Unless you only ever make vertical cuts (i.e. with the TS55 at 90°) the MFT tops are consumables.  Over time, as you cut different thicknesses and different angles the groove made by the blade gets progressively more ragged.

People have tried filling it, and then sanding it flat.  I routed a dado and made an insert in mine, but I'm not sure it was worth the effort.

My guess is that for anyone who uses theirs more intensively than a casual hobbyist will be changing or flipping the top before it sags anyway.

If you don't fancy buying a replacement from Festool, or a Valchromat one from Axminster, you can easily make your own.  You can use Peter Parfitt's jig, but if you only need one every few years that's a relatively expensive option.  I have used my MFT top as a routing template (using a copy bit) to make a replacement.

Andrew
TS55, MFT/3, OF1400, OF1010, CT26, RS100, ETS125, CXS, MFS400, DF-500, Zobos.

Offline Michael Kellough

  • Posts: 3288
Re: MFT/3 MDF top warping
« Reply #8 on: March 05, 2018, 07:32 AM »
The MFT is designed to be a portable work table. It is expected to spend much if not most of the time folded and vertical so the mdf surface would avoid the constant strain of gravity.

If you leave it horizontal for a long time the mdf will sag. Just flip it.

Re: MFT/3 MDF top warping
« Reply #9 on: March 06, 2018, 12:22 PM »
Yes, the mfd is junk, we replaced ours after the first job with hdf. It costs a little more but is well worth it. If you don't have a cnc and want the full use, go to a cnc shop and have them make you one. Once they have it in their library, they will be easy to replace on a regular basis.