Just make sure you can prove business use only in case you're audited on this in the future.
Overall, it would make more sense to just rent the equipment you need for this project. Then 100% of your rental cost is fully deductible as a rental expense in the tax year you pay it. By purchasing the equipment, you increase paperwork now, and in the future. Then you also have to deal with depreciation recapture rules in the tax year you sell or otherwise dispose of the equipment. It can, and probably will, turn into a nightmare.
